56979371520 has 120 divisors (see below), whose sum is σ = 197335668816. Its totient is φ = 15194492928.

The previous prime is 56979371513. The next prime is 56979371531. The reversal of 56979371520 is 2517397965.

56979371520 is a `hidden beast` number, since 569 + 7 + 9 + 3 + 71 + 5 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×56979371520² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1213492 + ... + 1259571.

Almost surely, 2^56979371520 is an apocalyptic number.

It is an amenable number.

56979371520 is an abundant number, since it is smaller than the sum of its proper divisors (140356297296).

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

56979371520 is a wasteful number, since it uses less digits than its factorization.

56979371520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2473092 (or 2473073 counting only the distinct ones).

The product of its (nonzero) digits is 3572100, while the sum is 54.

The spelling of 56979371520 in words is "fifty-six billion, nine hundred seventy-nine million, three hundred seventy-one thousand, five hundred twenty".