56979815 has 16 divisors (see below), whose sum is σ = 71287392. Its totient is φ = 43680384.

The previous prime is 56979787. The next prime is 56979821. The reversal of 56979815 is 51897965.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 56979815 - 2¹² = 56975719 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 10097 + ... + 14693.

It is an arithmetic number, because the mean of its divisors is an integer number (4455462).

Almost surely, 2^56979815 is an apocalyptic number.

56979815 is a deficient number, since it is larger than the sum of its proper divisors (14307577).

56979815 is a wasteful number, since it uses less digits than its factorization.

56979815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4706.

The product of its digits is 680400, while the sum is 50.

The square root of 56979815 is about 7548.4975326220. The cubic root of 56979815 is about 384.8046796968.

The spelling of 56979815 in words is "fifty-six million, nine hundred seventy-nine thousand, eight hundred fifteen".