1. 28 is a triangular number since it is the sum of the first seven counting numbers: 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28.
2. 28 is also a perfect number since the sum of its aliquot divisors (factors that are less than the number itself) is also 28. The aliquot factors of 28 are 1, 2, 4, 7, and 14, and 1 + 2 + 4 + 7 + 14 = 28. The next smallest perfect number is 6, and the next highest perfect number is 496.
3. 28 is an example of a happy number. When you square the digits, add them, and repeat this process on the resulting number, you eventually end up with 1:
2^2 + 8^2 = 68
6^2 + 8^2 = 100
1^2 + 0^2 + 0^2 = 1
4. The sum of the first five prime numbers is 2 + 3 + 5 + 7 + 11 = 28.
5. 28 is a hexagonal number, but not a centered hexagonal number. Every hexagonal number is also a triangular number, but not every triangular number is a hexagonal number.
6. A polygon with 28 sides is called an icosikaioctagon.
7. Between the years 2000 and 2099, the calendar repeats every 28 years. It also cycles every 28 years between 2101 and 2199.
Sunday, June 28, 2015
Special properties of number 28 (Today’s Date)
Subscribe to:
Post Comments (Atom)
HAPPY PI DAY
๐๐๐๐๐ ๐๐ ๐๐๐ Celebrated annually on March 14th (3/14), Pi Day is a fun and delicious way to geek out about math! It's a day ...
-
Dear All, Pi Day is held to celebrate the mathematical constant ฯ (pi). Pi Day is observed on March 14 (3/14) , due to ฯ being approximately...
-
Dear All By this time, I hope that you must have gone through the last year Question Paper and the Sample Papers released by CBSE. I am p...
-
Dear Students I am very glad to make available all the assignments already given to you in the school (Class X, XI and XII...
No comments:
Post a Comment