56825721 has 6 divisors (see below), whose sum is σ = 82081610. Its totient is φ = 37883808.

The previous prime is 56825707. The next prime is 56825729. The reversal of 56825721 is 12752865.

It is a happy number.

56825721 is a `hidden beast` number, since 5 + 6 + 82 + 572 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46172025 + 10653696 = 6795^2 + 3264^2 .

It is not a de Polignac number, because 56825721 - 2²² = 52631417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56825729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3156976 + ... + 3156993.

Almost surely, 2^56825721 is an apocalyptic number.

It is an amenable number.

56825721 is a deficient number, since it is larger than the sum of its proper divisors (25255889).

56825721 is a wasteful number, since it uses less digits than its factorization.

56825721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6313975 (or 6313972 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 56825721 is about 7538.2836906023. The cubic root of 56825721 is about 384.4574829135.

The spelling of 56825721 in words is "fifty-six million, eight hundred twenty-five thousand, seven hundred twenty-one".