56691890920 has 64 divisors (see below), whose sum is σ = 145806739200. Its totient is φ = 19433541120.

The previous prime is 56691890917. The next prime is 56691890923. The reversal of 56691890920 is 2909819665.

It is a happy number.

56691890920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (56691890917) and next prime (56691890923).

It is not an unprimeable number, because it can be changed into a prime (56691890923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1756125 + ... + 1788115.

It is an arithmetic number, because the mean of its divisors is an integer number (2278230300).

Almost surely, 2^56691890920 is an apocalyptic number.

It is an amenable number.

56691890920 is an abundant number, since it is smaller than the sum of its proper divisors (89114848280).

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

56691890920 is a wasteful number, since it uses less digits than its factorization.

56691890920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38338 (or 38334 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 55.

The spelling of 56691890920 in words is "fifty-six billion, six hundred ninety-one million, eight hundred ninety thousand, nine hundred twenty".