57312639 has 6 divisors (see below), whose sum is σ = 82784936. Its totient is φ = 38208420.

The previous prime is 57312623. The next prime is 57312643. The reversal of 57312639 is 93621375.

57312639 is a `hidden beast` number, since 5 + 7 + 3 + 12 + 639 = 666.

It is not a de Polignac number, because 57312639 - 2⁴ = 57312623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57312139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3184027 + ... + 3184044.

Almost surely, 2^57312639 is an apocalyptic number.

57312639 is a deficient number, since it is larger than the sum of its proper divisors (25472297).

57312639 is a wasteful number, since it uses less digits than its factorization.

57312639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6368077 (or 6368074 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 57312639 is about 7570.5111452266. The cubic root of 57312639 is about 385.5524513914.

The spelling of 57312639 in words is "fifty-seven million, three hundred twelve thousand, six hundred thirty-nine".