56581865 has 12 divisors (see below), whose sum is σ = 72129036. Its totient is φ = 42601728.

The previous prime is 56581859. The next prime is 56581897. The reversal of 56581865 is 56818565.

It can be written as a sum of positive squares in 6 ways, for example, as 9357481 + 47224384 = 3059^2 + 6872^2 .

It is not a de Polignac number, because 56581865 - 2⁴ = 56581849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18134 + ... + 21023.

It is an arithmetic number, because the mean of its divisors is an integer number (6010753).

Almost surely, 2^56581865 is an apocalyptic number.

It is an amenable number.

56581865 is a deficient number, since it is larger than the sum of its proper divisors (15547171).

56581865 is a wasteful number, since it uses less digits than its factorization.

56581865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39196 (or 39179 counting only the distinct ones).

The product of its digits is 288000, while the sum is 44.

The square root of 56581865 is about 7522.0917968342. The cubic root of 56581865 is about 383.9067540699.

The spelling of 56581865 in words is "fifty-six million, five hundred eighty-one thousand, eight hundred sixty-five".