56728915 has 16 divisors (see below), whose sum is σ = 74407680. Its totient is φ = 41333760.

The previous prime is 56728907. The next prime is 56728933. The reversal of 56728915 is 51982765.

It is not a de Polignac number, because 56728915 - 2³ = 56728907 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8130 + ... + 13399.

It is an arithmetic number, because the mean of its divisors is an integer number (4650480).

Almost surely, 2^56728915 is an apocalyptic number.

56728915 is a deficient number, since it is larger than the sum of its proper divisors (17678765).

56728915 is a wasteful number, since it uses less digits than its factorization.

56728915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21582.

The product of its digits is 151200, while the sum is 43.

The square root of 56728915 is about 7531.8599960435. The cubic root of 56728915 is about 384.2390434187.

The spelling of 56728915 in words is "fifty-six million, seven hundred twenty-eight thousand, nine hundred fifteen".