#1  
Old 03-15-2004, 04:58 PM
wolf_meister wolf_meister is offline
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Find 28 interesting facts about 28

This should be an easy one for the "Dopers".
Here's some I've already found:
1) 28 is the second perfect number being the sum of its divisors: 1; 2; 4; 7; 14

2) 28 is the sum of the first 5 prime numbers 2; 3; 5; 7; 11

3) There are 28 days in a non-leap-year February.

This is not a homework assignment. (It's been decades since I've had a homework assignment. LOL)

Anyway, just 25 more fun-facts to go for the number 28.
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  #2  
Old 03-15-2004, 05:48 PM
SPOOFE SPOOFE is offline
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4. It was named for famed English physicist, William Twentyeighterson.
  #3  
Old 03-15-2004, 06:39 PM
if6was9 if6was9 is offline
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Quote:
Originally Posted by SPOOFE
4. It was named for famed English physicist, William Twentyeighterson.
Four touchdowns (with extra points.)
The moon orbits in 28 days.
A "normal" menstrual cycle is 28 days.
  #4  
Old 03-15-2004, 06:40 PM
if6was9 if6was9 is offline
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Whoops, quoted instead of posted....
  #5  
Old 03-15-2004, 07:35 PM
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28

The number of Reese Cup Miniatures I've eaten in the last 12 minutes.

Ruby, the PMS Poster Child
  #6  
Old 03-15-2004, 07:41 PM
moejuck moejuck is offline
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28 is the square root of 784.

Both of the digits in 28 are powers of 2.

*You really miss the consecutive number thread don't you Wolf Meister
  #7  
Old 03-15-2004, 08:27 PM
wolf_meister wolf_meister is offline
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LOL MoeJuck
As I've said, I had a love/hate relationship with that thread. I loved finding weird and or oddball properties for those numbers (.... this is a sum of 2 triangular numbers and 3 consecutive primes....)
But as I've said, I sometimes would spend up to 30 minutes just to post one number. (So it is good that it is gone.................. but :::: sigh ::::

Anyway - another "fun fact" about 28?
In the short run, the calendar runs on a 28 year cycle. (This is due to 7 days per week and a leap day every 4 years.) Of course what messes this up is that 3 out of 4 century years cannot be Leap Years and so in the long run the calendar is actually on a 400 year cycle.

And for those of you still awake, another fun fact of 28? It is the last 2 digits of www.1728.com - not only a great website but possibly the greatest achievement in Western Civilization - the world shall never see its like again (IMHO). LOL
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Old 03-15-2004, 10:23 PM
wolf_meister wolf_meister is offline
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Geez, I thought I would have had a plethora of fun facts about 28 by now.

Okay 28 Days A Sandra Bullock movie from 2000

28 Days Later Although sounding as if its the sequel to the above movie, it is actually a sci-fi movie from 2002.
  #9  
Old 03-15-2004, 10:56 PM
Really Not All That Bright Really Not All That Bright is offline
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Um... it lies exactly between 27 and 29?

An NFL football has a circumference of 28 inches at its widest point, and is approximately 28 centimeters long.
  #10  
Old 03-15-2004, 11:10 PM
TJdude825 TJdude825 is offline
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If you liked that thread, you might like http://www.stetson.edu/~efriedma/numbers.html

Um... a solution for 28 in the "four 4's" problem is

44 - 4*4

It's 11100 in binary or 1C in hex.

It's 2/3 of the "meaning of life" (42)

Oh, what's that? Interesting facts? Sorry...
  #11  
Old 03-16-2004, 03:04 PM
wolf_meister wolf_meister is offline
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Geez, how did we forget this one ?

28 is a triangular number being the sum of the integers 1 through 7 !!!

Wow where's the smack-the-head icon when you need it ?

Boy is my face red !!!

Even counting the "Peanut ButterCups" posting, we're barely past the half-way mark.
  #12  
Old 03-16-2004, 05:08 PM
Bear_Nenno Bear_Nenno is offline
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wait wait wait. . .

In regards to your first "fact":

How can you have the number (1) without the number (28)??
Shouldn't it be 1,2,4,7,14,28?? And therefore not be the sum of its divisors?

If it's the second number with this quality, what is the first?
  #13  
Old 03-16-2004, 05:42 PM
Tapioca Dextrin Tapioca Dextrin is offline
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28 is the the first triangular number to be the sum of two cubes 13+33.

The longest known sociable chain has 28 links, starting with 12,496.

Much more importantly, there are 28 dominoes in a standard double-six set.
  #14  
Old 03-16-2004, 06:00 PM
Ghanima Ghanima is offline
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28 is double the number of this post in this thread!

Thank you.
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Old 03-16-2004, 06:13 PM
wolf_meister wolf_meister is offline
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Bear_Nenno
I'm as unhappy about the "perfect number" definition as you are.
You don't count 1 as a factor, You don't count 1 as a prime number, so why on earth do "they" decide that 1 is a divisor?

Oh and the 1st perfect number is 6.

Tapioca that's great - keep up the good work !!!

Ghanima - well thanks for your help too.
  #16  
Old 03-16-2004, 06:32 PM
Tapioca Dextrin Tapioca Dextrin is offline
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The probability of dealing a perfect hand in bridge is 1 in 2,235,197,406,895,366,368,301,560,000 - which has 28 digits.
  #17  
Old 03-16-2004, 06:52 PM
if6was9 if6was9 is offline
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28 is the atomic number of nickel.
  #18  
Old 03-16-2004, 06:57 PM
if6was9 if6was9 is offline
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Matthew and Acts are the only books of the bible with 28 chapters.
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Old 03-16-2004, 07:11 PM
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28 is the number of letters in "Numerology is just pareidolia" + 2 which is the first prime number!!!
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Old 03-16-2004, 07:20 PM
emekthian emekthian is offline
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28 is XXVIII in Roman Numerals
  #21  
Old 03-16-2004, 07:41 PM
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Texas was the 28th state admitted to the U.S.
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Old 03-16-2004, 07:47 PM
Captain Carrot Captain Carrot is offline
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28 is the 4th prime times the second prime squared, which happens to be 4.

It's also a perfect number, as others have said: 1+2+4+7+14=28, and for whatever reason 1 is counted, but not 28. (Well, if the number itself were counted, there would be no perfect numbers.)

Need sleep so much...
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  #23  
Old 03-16-2004, 07:55 PM
Tapioca Dextrin Tapioca Dextrin is offline
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The First World War was triggered by the assassination of Archduke Franz Ferdinand on June 28, 1914

It was formally ended by the Treaty of Versailles which was signed on June 28 1919.

The Three Mile Island incident took place on March 28 1979.

The most common isotope of Silicon has an atomic weight of 28
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Old 03-16-2004, 07:55 PM
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Title 28 of the U.S. Code deals with the judiciary and judicial procedure.
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Old 03-16-2004, 08:06 PM
if6was9 if6was9 is offline
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"28 Days" is a nasty Sandra Bullock movie.....
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Old 03-16-2004, 08:07 PM
if6was9 if6was9 is offline
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The Space Shuttle Challenger expired on January 28, 1986.
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Old 03-16-2004, 08:18 PM
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28 years ago was the bicentennial.
  #28  
Old 03-16-2004, 11:41 PM
Bear_Nenno Bear_Nenno is offline
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Quote:
Originally Posted by dwalin
28 is the 4th prime times the second prime squared, which happens to be 4.

It's also a perfect number, as others have said: 1+2+4+7+14=28, and for whatever reason 1 is counted, but not 28. (Well, if the number itself were counted, there would be no perfect numbers.)

Need sleep so much...
Oh.... so "Pefect Numbers" are a real math thing? Not just made up here? What the hell is the purpose of that? Who cares? Why? Who came up with that? Are they as significant as prime numbers? Would the aliens be just as likely to send us an encrypted message in a pattern of Perfect Numbers as they would Prime Numbers? You know... like they did in that one movie...
  #29  
Old 03-16-2004, 11:45 PM
No Me Ayudes Compadre No Me Ayudes Compadre is offline
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The tweny-eighth result of an Altavista search of "twenty-eight" is a page entitled "Twenty-Eight Common Mistakes," which contains a list of 29 common mistakes in job hunting.
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Old 03-16-2004, 11:46 PM
No Me Ayudes Compadre No Me Ayudes Compadre is offline
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Erk. Twenty-eighth. The 29 isn't a typo, though.
  #31  
Old 03-17-2004, 12:04 AM
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Woodrow Wilson was president number 28.
  #32  
Old 03-17-2004, 12:37 AM
wolf_meister wolf_meister is offline
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A sci-fi movie from 1957 was titled "The 27th Day".
If Hollywood ever films the "long-awaited" sequel, would they call it "The 28th day" ?

Well, I'd say we have more than enough "fun facts".

Thanks for all your help folks.

Of course, if you feel you must post more "fun facts" about 28 please feel free to do so.
  #33  
Old 03-17-2004, 12:49 AM
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Quote:
Originally Posted by Bear_Nenno
Oh.... so "Pefect Numbers" are a real math thing? Not just made up here? What the hell is the purpose of that? Who cares? Why? Who came up with that? Are they as significant as prime numbers?
The Pythagoreans, who were intrigued by numbers and attributed mystical significance to (at least some of) them, designated the ones that are sums of their divisors as "perfect numbers." For many centuries afterward, scholars were then also more concerned with the mystical or religious significance of these numbers than their mathematical properties. Philo Judaeus of Alexandria, and later St. Augustine, suggested the perfection of God's handiwork because the world was created in 6 days, which is the first perfect number; as well, other Biblical commentators have used 28 -- the number of days in a lunar cycle* -- as evidence of the perfection of the Universe.

Mathematically, perfect numbers are intimately associated with Mersenne primes, where the search for new values has, AFAIK, no practical applications (other than discovering new algorithms for finding more Mersennes), but then you get into the larger question of how or why pure mathematics is useful at all.

Since we're done with "28 fun facts," it is perhaps now appropriate for me to point out that my number theory textbook only lists 27 perfect numbers -- which were the only ones known at the time of publication. The 28th, and many more, have been discovered since then. That'll tell you how ancient I am.

* For some reason, I thought it was 29.5 days. But what do I know.
  #34  
Old 03-17-2004, 01:19 AM
wolf_meister wolf_meister is offline
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Earthling
The Moon's sidereal period is about 28 days whereas its synodic period is 29.5 days so you are partially right.
The sidereal period is the time it takes the Moon to reach the same position in the sky (the background of the stars) or the time it takes the Moon to return to the same celestial longitude.
The synodic period which is much more widely known is the time for the Moon to go through 1 complete phase cycle. For example, the time from one Full Moon to the next averages 29.5 days.
  #35  
Old 03-17-2004, 04:38 AM
cactus waltz cactus waltz is offline
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A license plate on the cover to the Beatles album "Abbey Road" reads "IF28", which spun the theories that Paul McCartney would die at that age.
  #36  
Old 03-17-2004, 08:17 AM
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28 is the basis of one of Abbot and Costello's best comedy sketches: 7 X 14 = 28

They "prove" that the equation is correct. Three different ways.
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Old 03-17-2004, 08:19 AM
RealityChuck RealityChuck is offline
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Sorry -- I made a typo. The equation is 7 x 13 = 28.

Saying 7 x 14 =28 is ridiculous.
  #38  
Old 03-17-2004, 11:46 AM
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There are 28 digits (width of finger) in a cubit.
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Old 03-17-2004, 12:16 PM
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"28" was the name I gave to my pet budgie when I was little.

Seriously.
  #40  
Old 03-17-2004, 12:25 PM
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I used to claim I was 28 until I was 37... and get away with it...
I'm 32 now... honest...
  #41  
Old 03-17-2004, 12:33 PM
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28 is the absolute highest any rabbit has ever counted.
  #42  
Old 03-17-2004, 01:11 PM
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Originally Posted by lieu
28 is the absolute highest any rabbi has ever counted.
We'll have no Anti-Semitism on this thread if you don't mind...
  #43  
Old 03-17-2004, 01:56 PM
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Sorry lieu, that was out of order changing a quote. I just couldn't resist it.
  #44  
Old 03-17-2004, 02:03 PM
Draelin Draelin is offline
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I am 28 years old!

Okay, not an interesting fact, but still a fact!
  #45  
Old 03-17-2004, 02:14 PM
Paul in Qatar Paul in Qatar is offline
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Go here:

http://en.wikipedia.org/wiki/Number_28

Thank you.
  #46  
Old 03-17-2004, 06:49 PM
wolf_meister wolf_meister is offline
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Paul
Interesting link. It's funny that we came up with a lot of those on our own.
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