56656872 has 24 divisors (see below), whose sum is σ = 153445890. Its totient is φ = 18885600.

The previous prime is 56656867. The next prime is 56656877. The reversal of 56656872 is 27865665.

56656872 is a `hidden beast` number, since 566 + 5 + 6 + 87 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (56656867) and next prime (56656877).

It can be written as a sum of positive squares in only one way, i.e., 47692836 + 8964036 = 6906^2 + 2994^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×56656872² = 6420002289648768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56656877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 393379 + ... + 393522.

Almost surely, 2^56656872 is an apocalyptic number.

It is an amenable number.

56656872 is an abundant number, since it is smaller than the sum of its proper divisors (96789018).

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

56656872 is a wasteful number, since it uses less digits than its factorization.

56656872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786913 (or 786906 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 56656872 is about 7527.0759262811. The cubic root of 56656872 is about 384.0763194660.

The spelling of 56656872 in words is "fifty-six million, six hundred fifty-six thousand, eight hundred seventy-two".