77081256 has 48 divisors (see below), whose sum is σ = 238586400. Its totient is φ = 22023072.

The previous prime is 77081243. The next prime is 77081261. The reversal of 77081256 is 65218077.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 77081256.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75966 + ... + 76973.

It is an arithmetic number, because the mean of its divisors is an integer number (4970550).

Almost surely, 2^77081256 is an apocalyptic number.

It is an amenable number.

77081256 is an abundant number, since it is smaller than the sum of its proper divisors (161505144).

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

77081256 is a wasteful number, since it uses less digits than its factorization.

77081256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152958 (or 152951 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 77081256 is about 8779.5931568610. The cubic root of 77081256 is about 425.5816828616.

The spelling of 77081256 in words is "seventy-seven million, eighty-one thousand, two hundred fifty-six".