57031728 has 40 divisors (see below), whose sum is σ = 158666928. Its totient is φ = 17548032.

The previous prime is 57031721. The next prime is 57031747. The reversal of 57031728 is 82713075.

It is not an unprimeable number, because it can be changed into a prime (57031721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45075 + ... + 46322.

Almost surely, 2^57031728 is an apocalyptic number.

It is an amenable number.

57031728 is an abundant number, since it is smaller than the sum of its proper divisors (101635200).

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

57031728 is a wasteful number, since it uses less digits than its factorization.

57031728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91421 (or 91415 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 57031728 is about 7551.9353810795. The cubic root of 57031728 is about 384.9215064581.

The spelling of 57031728 in words is "fifty-seven million, thirty-one thousand, seven hundred twenty-eight".