55866564 has 48 divisors (see below), whose sum is σ = 155984640. Its totient is φ = 17189280.

The previous prime is 55866541. The next prime is 55866581. The reversal of 55866564 is 46566855.

It is a happy number.

55866564 is a `hidden beast` number, since 5 + 5 + 86 + 6 + 564 = 666.

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, 18492 + ... + 21299.

It is an arithmetic number, because the mean of its divisors is an integer number (3249680).

Almost surely, 2^55866564 is an apocalyptic number.

55866564 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

55866564 is an abundant number, since it is smaller than the sum of its proper divisors (100118076).

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

55866564 is a wasteful number, since it uses less digits than its factorization.

55866564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39817 (or 39809 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The square root of 55866564 is about 7474.3938884702. The cubic root of 55866564 is about 382.2821212062.

The spelling of 55866564 in words is "fifty-five million, eight hundred sixty-six thousand, five hundred sixty-four".