56638911 has 16 divisors (see below), whose sum is σ = 86413824. Its totient is φ = 32325024.

The previous prime is 56638909. The next prime is 56638957. The reversal of 56638911 is 11983665.

It is not a de Polignac number, because 56638911 - 2¹ = 56638909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56638911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56638961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27721 + ... + 29693.

It is an arithmetic number, because the mean of its divisors is an integer number (5400864).

Almost surely, 2^56638911 is an apocalyptic number.

56638911 is a deficient number, since it is larger than the sum of its proper divisors (29774913).

56638911 is a wasteful number, since it uses less digits than its factorization.

56638911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3350.

The product of its digits is 38880, while the sum is 39.

The square root of 56638911 is about 7525.8827389217. The cubic root of 56638911 is about 384.0357293686.

The spelling of 56638911 in words is "fifty-six million, six hundred thirty-eight thousand, nine hundred eleven".