77912831256 has 32 divisors (see below), whose sum is σ = 209765315760. Its totient is φ = 23973178752.

The previous prime is 77912831239. The next prime is 77912831263. The reversal of 77912831256 is 65213821977.

It is a junction number, because it is equal to n+sod(n) for n = 77912831199 and 77912831208.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124859995 + ... + 124860618.

Almost surely, 2^77912831256 is an apocalyptic number.

It is an amenable number.

77912831256 is an abundant number, since it is smaller than the sum of its proper divisors (131852484504).

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

77912831256 is a wasteful number, since it uses less digits than its factorization.

77912831256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249720635 (or 249720631 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 51.

The spelling of 77912831256 in words is "seventy-seven billion, nine hundred twelve million, eight hundred thirty-one thousand, two hundred fifty-six".