77085440 has 36 divisors (see below), whose sum is σ = 184646784. Its totient is φ = 30833664.

The previous prime is 77085439. The next prime is 77085511. The reversal of 77085440 is 4458077.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 77085440.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28832 + ... + 31391.

Almost surely, 2^77085440 is an apocalyptic number.

It is an amenable number.

77085440 is an abundant number, since it is smaller than the sum of its proper divisors (107561344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77085440 is an equidigital number, since it uses as much as digits as its factorization.

77085440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60244 (or 60230 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 77085440 is about 8779.8314334616. The cubic root of 77085440 is about 425.5893829677.

The spelling of 77085440 in words is "seventy-seven million, eighty-five thousand, four hundred forty".