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Twenty-seven (27) is the natural number following twenty-six and preceding twenty-eight.

Twenty-seven is a perfect cube, being 33 = 3 × 3 × 3. It is the magic result of a prime reciprocal magic square of the multiples of 1/7.

A 10,000-day-old person is 27 years old (and some months).

Twenty-seven is also:

See also: twenty-five, twenty-six, twenty-eight, twenty-nine, integer, list of numbers.

This article is about the number. For the year A.D. 27, see 27.