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, and therefore the number of tiles in a double-six domino set.

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.

In googology Edit

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

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.