55815864 has 32 divisors (see below), whose sum is σ = 150274320. Its totient is φ = 17174016.

The previous prime is 55815857. The next prime is 55815889. The reversal of 55815864 is 46851855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89137 + ... + 89760.

Almost surely, 2^55815864 is an apocalyptic number.

It is an amenable number.

55815864 is an abundant number, since it is smaller than the sum of its proper divisors (94458456).

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

55815864 is a wasteful number, since it uses less digits than its factorization.

55815864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178919 (or 178915 counting only the distinct ones).

The product of its digits is 192000, while the sum is 42.

The square root of 55815864 is about 7471.0015392851. The cubic root of 55815864 is about 382.1664433707.

The spelling of 55815864 in words is "fifty-five million, eight hundred fifteen thousand, eight hundred sixty-four".