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Twenty-eight (28) is a positive integer one more than 27 one less than 29.

Properties Edit

28 is an even composite number.

28 is the 7th triangular number, and therefore the number of tiles in a double-six domino set.

28 is the 4th hexagonal number.

28 is equal to 7!!!, the triple factorial of 7.

28 is equal to the sum of its proper divisors: 1 + 2 + 4 + 7 + 14 = 28. This makes it a perfect number, the neighboring ones being 6 and 496. Ignoring Easter, the Julian calendar repeats every 28 years.
File:28-0.png
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