56757657720 has 32 divisors (see below), whose sum is σ = 170272973520. Its totient is φ = 15135375360.

The previous prime is 56757657703. The next prime is 56757657721. The reversal of 56757657720 is 2775675765.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56757657721) 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, 236490121 + ... + 236490360.

Almost surely, 2^56757657720 is an apocalyptic number.

It is an amenable number.

56757657720 is an abundant number, since it is smaller than the sum of its proper divisors (113515315800).

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

56757657720 is a wasteful number, since it uses less digits than its factorization.

56757657720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472980495 (or 472980491 counting only the distinct ones).

The product of its (nonzero) digits is 21609000, while the sum is 57.

The spelling of 56757657720 in words is "fifty-six billion, seven hundred fifty-seven million, six hundred fifty-seven thousand, seven hundred twenty".