56391974864 has 40 divisors (see below), whose sum is σ = 115707538440. Its totient is φ = 26532569088.

The previous prime is 56391974851. The next prime is 56391974867. The reversal of 56391974864 is 46847919365.

56391974864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4198003264 + 52193971600 = 64792^2 + 228460^2 .

It is a junction number, because it is equal to n+sod(n) for n = 56391974797 and 56391974806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56391974867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1799522 + ... + 1830590.

It is an arithmetic number, because the mean of its divisors is an integer number (2892688461).

Almost surely, 2^56391974864 is an apocalyptic number.

It is an amenable number.

56391974864 is an abundant number, since it is smaller than the sum of its proper divisors (59315563576).

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

56391974864 is a wasteful number, since it uses less digits than its factorization.

56391974864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37767 (or 37761 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 62.

The spelling of 56391974864 in words is "fifty-six billion, three hundred ninety-one million, nine hundred seventy-four thousand, eight hundred sixty-four".