55609980 has 48 divisors (see below), whose sum is σ = 156266880. Its totient is φ = 14776128.

The previous prime is 55609973. The next prime is 55609991. The reversal of 55609980 is 8990655.

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, 16911 + ... + 19929.

It is an arithmetic number, because the mean of its divisors is an integer number (3255560).

Almost surely, 2^55609980 is an apocalyptic number.

It is an amenable number.

55609980 is an abundant number, since it is smaller than the sum of its proper divisors (100656900).

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

55609980 is a wasteful number, since it uses less digits than its factorization.

55609980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3338 (or 3336 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 55609980 is about 7457.2099340169. The cubic root of 55609980 is about 381.6959743920.

The spelling of 55609980 in words is "fifty-five million, six hundred nine thousand, nine hundred eighty".