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28 (twenty-eight) is a positive integer following 27 and preceding 29. Its ordinal form is written "28th" or "twenty-eighth".

Properties Edit

28 is an even composite number.

28 is the 7th triangular number.

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.

In googology Edit

In Greek-based number-naming systems, 28 is associated with prefix "octoicosa-", and with prefix "octoviginti-" in Latin systems.

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