57506728 has 8 divisors (see below), whose sum is σ = 107825130. Its totient is φ = 28753360.

The previous prime is 57506671. The next prime is 57506731. The reversal of 57506728 is 82760575.

It can be written as a sum of positive squares in only one way, i.e., 39715204 + 17791524 = 6302^2 + 4218^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3594163 + ... + 3594178.

Almost surely, 2^57506728 is an apocalyptic number.

It is an amenable number.

57506728 is a deficient number, since it is larger than the sum of its proper divisors (50318402).

57506728 is a wasteful number, since it uses less digits than its factorization.

57506728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7188347 (or 7188343 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 57506728 is about 7583.3190622576. The cubic root of 57506728 is about 385.9871849129.

The spelling of 57506728 in words is "fifty-seven million, five hundred six thousand, seven hundred twenty-eight".