57120728 has 16 divisors (see below), whose sum is σ = 122401680. Its totient is φ = 24480288.

The previous prime is 57120671. The next prime is 57120737. The reversal of 57120728 is 82702175.

It is a junction number, because it is equal to n+sod(n) for n = 57120694 and 57120703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509951 + ... + 510062.

It is an arithmetic number, because the mean of its divisors is an integer number (7650105).

Almost surely, 2^57120728 is an apocalyptic number.

It is an amenable number.

57120728 is an abundant number, since it is smaller than the sum of its proper divisors (65280952).

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

57120728 is a wasteful number, since it uses less digits than its factorization.

57120728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020026 (or 1020022 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 57120728 is about 7557.8256132303. The cubic root of 57120728 is about 385.1216302046.

The spelling of 57120728 in words is "fifty-seven million, one hundred twenty thousand, seven hundred twenty-eight".