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Seventy-seven (77, LXXVII) is a natural number following seventy-six and preceding seventy-eight. It is the sum of three squares, 42 + 52 + 62, as well as the sum of the first seven prime numbers, but it is itself a composite number with the divisors being 7 and 11. Its factorization is:

Seventy-seven is also:

This article is about the number. For the year AD 77, see 77.