28 (number)

This article is about the number 28. For the year, see 28.
← 27 28 29 →
Cardinaltwenty-eight
Ordinal28th
(twenty-eighth)
Factorization22× 7
Greek numeralΚΗ´
Roman numeralXXVIII
Binary111002
Ternary10013
Quaternary1304
Quinary1035
Senary446
Octal348
Duodecimal2412
Hexadecimal1C16
Vigesimal1820
Base 36S36

28 (twenty-eight) is a number. It comes between twenty-seven and twenty-nine. Twenty-eight is an even number. It is divisible by 1, 2, 4, 7, 14, and 28. 28 is a perfect number. The perfect number before twenty-eight is six.

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