28 = 22 x 7.
28 is the second perfect number. It is the only even perfect number of the form x3 + 1.
28 is the sum of the first five prime numbers: 2 + 3 + 5 + 7 + 11 = 28.
28 is the seventh triangular number.
A standard domino set contains 28 dominoes.
Source: Number Gossip
28 is the second perfect number. It is the only even perfect number of the form x3 + 1.
28 is the sum of the first five prime numbers: 2 + 3 + 5 + 7 + 11 = 28.
28 is the seventh triangular number.
A standard domino set contains 28 dominoes.
Source: Number Gossip
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