56638836 has 18 divisors (see below), whose sum is σ = 143170482. Its totient is φ = 18879600.

The previous prime is 56638817. The next prime is 56638837. The reversal of 56638836 is 63883665.

56638836 is a `hidden beast` number, since 5 + 6 + 638 + 8 + 3 + 6 = 666.

56638836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 54110736 + 2528100 = 7356^2 + 1590^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 56638791 and 56638800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56638837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 786615 + ... + 786686.

Almost surely, 2^56638836 is an apocalyptic number.

It is an amenable number.

56638836 is an abundant number, since it is smaller than the sum of its proper divisors (86531646).

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

56638836 is a wasteful number, since it uses less digits than its factorization.

56638836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573311 (or 1573306 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 56638836 is about 7525.8777561159. The cubic root of 56638836 is about 384.0355598580.

The spelling of 56638836 in words is "fifty-six million, six hundred thirty-eight thousand, eight hundred thirty-six".