56638809 has 6 divisors (see below), whose sum is σ = 81811626. Its totient is φ = 37759200.

The previous prime is 56638801. The next prime is 56638817. The reversal of 56638809 is 90883665.

56638809 is a `hidden beast` number, since 5 + 6 + 638 + 8 + 0 + 9 = 666.

56638809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (56638801) and next prime (56638817).

It can be written as a sum of positive squares in only one way, i.e., 46621584 + 10017225 = 6828^2 + 3165^2 .

It is not a de Polignac number, because 56638809 - 2³ = 56638801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56638801) 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, 3146592 + ... + 3146609.

It is an arithmetic number, because the mean of its divisors is an integer number (13635271).

Almost surely, 2^56638809 is an apocalyptic number.

It is an amenable number.

56638809 is a deficient number, since it is larger than the sum of its proper divisors (25172817).

56638809 is a wasteful number, since it uses less digits than its factorization.

56638809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6293207 (or 6293204 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 56638809 is about 7525.8759623050. The cubic root of 56638809 is about 384.0354988341.

The spelling of 56638809 in words is "fifty-six million, six hundred thirty-eight thousand, eight hundred nine".