56815866 has 24 divisors (see below), whose sum is σ = 124941024. Its totient is φ = 18655560.

The previous prime is 56815859. The next prime is 56815867. The reversal of 56815866 is 66851865.

56815866 is a `hidden beast` number, since 5 + 68 + 1 + 586 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (56815867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22350 + ... + 24761.

It is an arithmetic number, because the mean of its divisors is an integer number (5205876).

Almost surely, 2^56815866 is an apocalyptic number.

56815866 is an abundant number, since it is smaller than the sum of its proper divisors (68125158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56815866 is a wasteful number, since it uses less digits than its factorization.

56815866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47186 (or 47183 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 56815866 is about 7537.6299988790. The cubic root of 56815866 is about 384.4352567837.

The spelling of 56815866 in words is "fifty-six million, eight hundred fifteen thousand, eight hundred sixty-six".