57312732 has 24 divisors (see below), whose sum is σ = 133909776. Its totient is φ = 19078528.

The previous prime is 57312719. The next prime is 57312737. The reversal of 57312732 is 23721375.

It is a self number, because there is not a number n which added to its sum of digits gives 57312732.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57312737) 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, 7498 + ... + 13070.

It is an arithmetic number, because the mean of its divisors is an integer number (5579574).

Almost surely, 2^57312732 is an apocalyptic number.

It is an amenable number.

57312732 is an abundant number, since it is smaller than the sum of its proper divisors (76597044).

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

57312732 is a wasteful number, since it uses less digits than its factorization.

57312732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6437 (or 6435 counting only the distinct ones).

The product of its digits is 8820, while the sum is 30.

The square root of 57312732 is about 7570.5172874778. The cubic root of 57312732 is about 385.5526599338.

The spelling of 57312732 in words is "fifty-seven million, three hundred twelve thousand, seven hundred thirty-two".