#1




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 nonleapyear February. This is not a homework assignment. (It's been decades since I've had a homework assignment. LOL) Anyway, just 25 more funfacts to go for the number 28. 
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#2




4. It was named for famed English physicist, William Twentyeighterson.

#3




Quote:
The moon orbits in 28 days. A "normal" menstrual cycle is 28 days. 
#4




Whoops, quoted instead of posted....

#5




28
The number of Reese Cup Miniatures I've eaten in the last 12 minutes. _{Ruby, the PMS Poster Child} 
#6




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




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




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 scifi movie from 2002. 
#9




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




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




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 smackthehead icon when you need it ? Boy is my face red !!! Even counting the "Peanut ButterCups" posting, we're barely past the halfway mark. 
#12




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




28 is the the first triangular number to be the sum of two cubes 1^{3}+3^{3}.
The longest known sociable chain has 28 links, starting with 12,496. Much more importantly, there are 28 dominoes in a standard doublesix set. 
#14




28 is double the number of this post in this thread!
Thank you. 
#15




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




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




28 is the atomic number of nickel.

#18




Matthew and Acts are the only books of the bible with 28 chapters.

#19




28 is the number of letters in "Numerology is just pareidolia" + 2 which is the first prime number!!!

#20




28 is XXVIII in Roman Numerals

#21




Texas was the 28th state admitted to the U.S.

#22




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




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




Title 28 of the U.S. Code deals with the judiciary and judicial procedure.

#25




"28 Days" is a nasty Sandra Bullock movie.....

#26




The Space Shuttle Challenger expired on January 28, 1986.

#27




28 years ago was the bicentennial.

#28




Quote:

#29




The twenyeighth result of an Altavista search of "twentyeight" is a page entitled "TwentyEight Common Mistakes," which contains a list of 29 common mistakes in job hunting.

#30




Erk. Twentyeighth. The 29 isn't a typo, though.

#31




Woodrow Wilson was president number 28.

#32




A scifi movie from 1957 was titled "The 27th Day".
If Hollywood ever films the "longawaited" 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




Quote:
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




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




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




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




Sorry  I made a typo. The equation is 7 x 13 = 28.
Saying 7 x 14 =28 is ridiculous. 
#38




There are 28 digits (width of finger) in a cubit.

#39




"28" was the name I gave to my pet budgie when I was little.
Seriously. 
#40




I used to claim I was 28 until I was 37... and get away with it...
I'm 32 now... honest... 
#41




28 is the absolute highest any rabbit has ever counted.

#42




Quote:

#43




Sorry lieu, that was out of order changing a quote. I just couldn't resist it.

#44




I am 28 years old!
Okay, not an interesting fact, but still a fact!
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"If the victorious army had to eat the fallen, war would be much less attractive." Belgarath the Sorcerer 
#45




#46




Paul
Interesting link. It's funny that we came up with a lot of those on our own. 
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