55728920 has 32 divisors (see below), whose sum is σ = 135036720. Its totient is φ = 20576640.

The previous prime is 55728901. The next prime is 55728947. The reversal of 55728920 is 2982755.

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, 53066 + ... + 54105.

Almost surely, 2^55728920 is an apocalyptic number.

It is an amenable number.

55728920 is an abundant number, since it is smaller than the sum of its proper divisors (79307800).

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

55728920 is a wasteful number, since it uses less digits than its factorization.

55728920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107195 (or 107191 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 55728920 is about 7465.1805068598. The cubic root of 55728920 is about 381.9679075403.

The spelling of 55728920 in words is "fifty-five million, seven hundred twenty-eight thousand, nine hundred twenty".