57297440 has 24 divisors (see below), whose sum is σ = 135365580. Its totient is φ = 22918912.

The previous prime is 57297431. The next prime is 57297451. The reversal of 57297440 is 4479275.

It can be written as a sum of positive squares in 2 ways, for example, as 57093136 + 204304 = 7556^2 + 452^2 .

It is a junction number, because it is equal to n+sod(n) for n = 57297394 and 57297403.

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, 178895 + ... + 179214.

Almost surely, 2^57297440 is an apocalyptic number.

It is an amenable number.

57297440 is an abundant number, since it is smaller than the sum of its proper divisors (78068140).

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

57297440 is a wasteful number, since it uses less digits than its factorization.

57297440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358124 (or 358116 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 57297440 is about 7569.5072494846. The cubic root of 57297440 is about 385.5183662407.

The spelling of 57297440 in words is "fifty-seven million, two hundred ninety-seven thousand, four hundred forty".