55555590 has 32 divisors (see below), whose sum is σ = 137933280. Its totient is φ = 14303744.

The previous prime is 55555579. The next prime is 55555631. The reversal of 55555590 is 9555555.

It is a Curzon 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, 31059 + ... + 32798.

It is an arithmetic number, because the mean of its divisors is an integer number (4310415).

Almost surely, 2^55555590 is an apocalyptic number.

55555590 is an abundant number, since it is smaller than the sum of its proper divisors (82377690).

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

55555590 is a wasteful number, since it uses less digits than its factorization.

55555590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63896.

The product of its (nonzero) digits is 140625, while the sum is 39.

The square root of 55555590 is about 7453.5622356025. The cubic root of 55555590 is about 381.5714930425.

The spelling of 55555590 in words is "fifty-five million, five hundred fifty-five thousand, five hundred ninety".