56915905 has 16 divisors (see below), whose sum is σ = 69891984. Its totient is φ = 44478720.

The previous prime is 56915863. The next prime is 56915909. The reversal of 56915905 is 50951965.

It can be written as a sum of positive squares in 8 ways, for example, as 350464 + 56565441 = 592^2 + 7521^2 .

It is a de Polignac number, because none of the positive numbers 2^k-56915905 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56915909) 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, 104935 + ... + 105475.

It is an arithmetic number, because the mean of its divisors is an integer number (4368249).

Almost surely, 2^56915905 is an apocalyptic number.

It is an amenable number.

56915905 is a deficient number, since it is larger than the sum of its proper divisors (12976079).

56915905 is a wasteful number, since it uses less digits than its factorization.

56915905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996.

The product of its (nonzero) digits is 60750, while the sum is 40.

The square root of 56915905 is about 7544.2630521476. The cubic root of 56915905 is about 384.6607569909.

The spelling of 56915905 in words is "fifty-six million, nine hundred fifteen thousand, nine hundred five".