56685870 has 24 divisors (see below), whose sum is σ = 147383496. Its totient is φ = 15116208.

The previous prime is 56685859. The next prime is 56685877. The reversal of 56685870 is 7858665.

56685870 is a `hidden beast` number, since 5 + 6 + 68 + 587 + 0 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56685877) 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, 314832 + ... + 315011.

It is an arithmetic number, because the mean of its divisors is an integer number (6140979).

Almost surely, 2^56685870 is an apocalyptic number.

56685870 is an abundant number, since it is smaller than the sum of its proper divisors (90697626).

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

56685870 is a wasteful number, since it uses less digits than its factorization.

56685870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629856 (or 629853 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The square root of 56685870 is about 7529.0019258863. The cubic root of 56685870 is about 384.1418339991.

It can be divided in two parts, 566 and 85870, that added together give a square (86436 = 294²).

The spelling of 56685870 in words is "fifty-six million, six hundred eighty-five thousand, eight hundred seventy".