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#1
03-15-2004, 05:58 PM
 wolf_meister Guest Join Date: May 2003 Location: Where the owls say "Whom" Posts: 5,484
Find 28 interesting facts about 28

This should be an easy one for the "Dopers".
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.
#2
03-15-2004, 06:48 PM
 SPOOFE Guest Join Date: Apr 2000 Location: SPOOFE Posts: 12,992
4. It was named for famed English physicist, William Twentyeighterson.
#3
03-15-2004, 07:39 PM
 if6was9 Guest Join Date: Jul 2003 Location: Waynesboro, PA Posts: 4,234
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
03-15-2004, 07:40 PM
 if6was9 Guest Join Date: Jul 2003 Location: Waynesboro, PA Posts: 4,234
#5
03-15-2004, 08:35 PM
 Ruby Guest Join Date: May 2001 Location: Indiana Posts: 5,838
28

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

Ruby, the PMS Poster Child
#6
03-15-2004, 08:41 PM
 moejuck Guest Join Date: Apr 2003 Posts: 699
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
03-15-2004, 09:27 PM
 wolf_meister Guest Join Date: May 2003 Location: Where the owls say "Whom" Posts: 5,484
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
#8
03-15-2004, 11:23 PM
 wolf_meister Guest Join Date: May 2003 Location: Where the owls say "Whom" Posts: 5,484
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
03-15-2004, 11:56 PM
 Really Not All That Bright Guest Join Date: May 2003 Location: Florida Posts: 67,149
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
03-16-2004, 12:10 AM
 TJdude825 Guest Join Date: Feb 2000 Location: California Posts: 2,505
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
03-16-2004, 04:04 PM
 wolf_meister Guest Join Date: May 2003 Location: Where the owls say "Whom" Posts: 5,484
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
03-16-2004, 06:08 PM
 Bear_Nenno Charter Member Join Date: Jun 2000 Location: Nangarhar Province Posts: 8,037
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
03-16-2004, 06:42 PM
 Tapioca Dextrin Guest Join Date: Dec 1999 Location: Staring blankly at my GPS Posts: 11,874
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
03-16-2004, 07:00 PM
 Ghanima Guest Join Date: Oct 2003 Location: East Bay Posts: 3,523
28 is double the number of this post in this thread!

Thank you.
#15
03-16-2004, 07:13 PM
 wolf_meister Guest Join Date: May 2003 Location: Where the owls say "Whom" Posts: 5,484
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
03-16-2004, 07:32 PM
 Tapioca Dextrin Guest Join Date: Dec 1999 Location: Staring blankly at my GPS Posts: 11,874
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
03-16-2004, 07:52 PM
 if6was9 Guest Join Date: Jul 2003 Location: Waynesboro, PA Posts: 4,234
28 is the atomic number of nickel.
#18
03-16-2004, 07:57 PM
 if6was9 Guest Join Date: Jul 2003 Location: Waynesboro, PA Posts: 4,234
Matthew and Acts are the only books of the bible with 28 chapters.
#19
03-16-2004, 08:11 PM
 agiantdwarf Guest Join Date: Mar 2002 Posts: 322
28 is the number of letters in "Numerology is just pareidolia" + 2 which is the first prime number!!!
#20
03-16-2004, 08:20 PM
 emekthian Guest Join Date: Nov 2003 Posts: 1,269
28 is XXVIII in Roman Numerals
#21
03-16-2004, 08:41 PM
 if6was9 Guest Join Date: Jul 2003 Location: Waynesboro, PA Posts: 4,234
Texas was the 28th state admitted to the U.S.
#22
03-16-2004, 08:47 PM
 Captain Carrot Guest Join Date: Jun 2003 Location: Sophomore at VTech Posts: 6,039
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
03-16-2004, 08:55 PM
 Tapioca Dextrin Guest Join Date: Dec 1999 Location: Staring blankly at my GPS Posts: 11,874
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
#24
03-16-2004, 08:55 PM
 pravnik Member Join Date: Apr 2002 Location: TX Posts: 13,386
Title 28 of the U.S. Code deals with the judiciary and judicial procedure.
#25
03-16-2004, 09:06 PM
 if6was9 Guest Join Date: Jul 2003 Location: Waynesboro, PA Posts: 4,234
"28 Days" is a nasty Sandra Bullock movie.....
#26
03-16-2004, 09:07 PM
 if6was9 Guest Join Date: Jul 2003 Location: Waynesboro, PA Posts: 4,234
The Space Shuttle Challenger expired on January 28, 1986.
#27
03-16-2004, 09:18 PM
 if6was9 Guest Join Date: Jul 2003 Location: Waynesboro, PA Posts: 4,234
28 years ago was the bicentennial.
#28
03-17-2004, 12:41 AM
 Bear_Nenno Charter Member Join Date: Jun 2000 Location: Nangarhar Province Posts: 8,037
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
03-17-2004, 12:45 AM
 No Me Ayudes Compadre Guest Join Date: May 1999 Location: Dolores de San Goloteo Posts: 635
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.
#30
03-17-2004, 12:46 AM
 No Me Ayudes Compadre Guest Join Date: May 1999 Location: Dolores de San Goloteo Posts: 635
Erk. Twenty-eighth. The 29 isn't a typo, though.
#31
03-17-2004, 01:04 AM
 don't ask Member Join Date: May 2001 Location: Sydney, Australia Posts: 17,683
Woodrow Wilson was president number 28.
#32
03-17-2004, 01:37 AM
 wolf_meister Guest Join Date: May 2003 Location: Where the owls say "Whom" Posts: 5,484
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
03-17-2004, 01:49 AM
 Earthling Guest Join Date: Mar 2001 Location: Up a creek with no paddle Posts: 1,376
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
03-17-2004, 02:19 AM
 wolf_meister Guest Join Date: May 2003 Location: Where the owls say "Whom" Posts: 5,484
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
03-17-2004, 05:38 AM
 cactus waltz Guest Join Date: Mar 2004 Location: Lund, Sweden Posts: 1,523
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
03-17-2004, 09:17 AM
 RealityChuck Charter Member Join Date: Apr 1999 Location: Schenectady, NY, USA Posts: 40,717
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.
#37
03-17-2004, 09:19 AM
 RealityChuck Charter Member Join Date: Apr 1999 Location: Schenectady, NY, USA Posts: 40,717
Sorry -- I made a typo. The equation is 7 x 13 = 28.

Saying 7 x 14 =28 is ridiculous.
#38
03-17-2004, 12:46 PM
 rsa Guest Join Date: Sep 2001 Posts: 2,108
There are 28 digits (width of finger) in a cubit.
#39
03-17-2004, 01:16 PM
 Duke Guest Join Date: Jul 1999 Location: North of Canada. Really. Posts: 7,710
"28" was the name I gave to my pet budgie when I was little.

Seriously.
#40
03-17-2004, 01:25 PM
 mascaroni Guest Join Date: Feb 2003 Location: England Posts: 1,924
I used to claim I was 28 until I was 37... and get away with it...
I'm 32 now... honest...
#41
03-17-2004, 01:33 PM
 lieu Member Join Date: Aug 2001 Location: Bedrock Posts: 26,079
28 is the absolute highest any rabbit has ever counted.
#42
03-17-2004, 02:11 PM
 mascaroni Guest Join Date: Feb 2003 Location: England Posts: 1,924
Quote:
 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
03-17-2004, 02:56 PM
 mascaroni Guest Join Date: Feb 2003 Location: England Posts: 1,924
Sorry lieu, that was out of order changing a quote. I just couldn't resist it.
#44
03-17-2004, 03:03 PM
 Draelin Member Join Date: Aug 2003 Location: Maine Posts: 7,282
I am 28 years old!

Okay, not an interesting fact, but still a fact!
#45
03-17-2004, 03:14 PM
 Paul in Qatar Guest Join Date: Jul 2002 Location: Dammam, Saudi Arabia Posts: 12,129
Go here:

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

Thank you.
#46
03-17-2004, 07:49 PM
 wolf_meister Guest Join Date: May 2003 Location: Where the owls say "Whom" Posts: 5,484
Paul
Interesting link. It's funny that we came up with a lot of those on our own.

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