55718920 has 32 divisors (see below), whose sum is σ = 125582400. Its totient is φ = 22249408.

The previous prime is 55718909. The next prime is 55718933. The reversal of 55718920 is 2981755.

It is a self number, because there is not a number n which added to its sum of digits gives 55718920.

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, 40077 + ... + 41443.

It is an arithmetic number, because the mean of its divisors is an integer number (3924450).

Almost surely, 2^55718920 is an apocalyptic number.

It is an amenable number.

55718920 is an abundant number, since it is smaller than the sum of its proper divisors (69863480).

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

55718920 is a wasteful number, since it uses less digits than its factorization.

55718920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397 (or 2393 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 55718920 is about 7464.5107006421. The cubic root of 55718920 is about 381.9450593939.

The spelling of 55718920 in words is "fifty-five million, seven hundred eighteen thousand, nine hundred twenty".