57213432 has 64 divisors (see below), whose sum is σ = 168285600. Its totient is φ = 17948160.

The previous prime is 57213391. The next prime is 57213437. The reversal of 57213432 is 23431275.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 57213396 and 57213405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57213437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4119 + ... + 11462.

Almost surely, 2^57213432 is an apocalyptic number.

It is an amenable number.

57213432 is an abundant number, since it is smaller than the sum of its proper divisors (111072168).

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

57213432 is a wasteful number, since it uses less digits than its factorization.

57213432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15613 (or 15603 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 57213432 is about 7563.9561077521. The cubic root of 57213432 is about 385.3298617866.

The spelling of 57213432 in words is "fifty-seven million, two hundred thirteen thousand, four hundred thirty-two".