56720881 has 8 divisors (see below), whose sum is σ = 66147200. Its totient is φ = 48617604.

The previous prime is 56720879. The next prime is 56720887. The reversal of 56720881 is 18802765.

It is not a de Polignac number, because 56720881 - 2¹ = 56720879 is a prime.

It is a super-2 number, since 2×56720881² = 6434516682832322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56720881.

It is not an unprimeable number, because it can be changed into a prime (56720887) 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, 82341 + ... + 83026.

It is an arithmetic number, because the mean of its divisors is an integer number (8268400).

Almost surely, 2^56720881 is an apocalyptic number.

It is an amenable number.

56720881 is a deficient number, since it is larger than the sum of its proper divisors (9426319).

56720881 is an equidigital number, since it uses as much as digits as its factorization.

56720881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165388 (or 165374 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 56720881 is about 7531.3266427635. The cubic root of 56720881 is about 384.2209038026.

The spelling of 56720881 in words is "fifty-six million, seven hundred twenty thousand, eight hundred eighty-one".