57311232 has 128 divisors (see below), whose sum is σ = 169866720. Its totient is φ = 17039360.

The previous prime is 57311207. The next prime is 57311237. The reversal of 57311232 is 23211375.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (57311237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1081318 + ... + 1081370.

Almost surely, 2^57311232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57311232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84933360).

57311232 is an abundant number, since it is smaller than the sum of its proper divisors (112555488).

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

57311232 is an equidigital number, since it uses as much as digits as its factorization.

57311232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 69 counting only the distinct ones).

The product of its digits is 1260, while the sum is 24.

The square root of 57311232 is about 7570.4182183021. The cubic root of 57311232 is about 385.5492963180.

The spelling of 57311232 in words is "fifty-seven million, three hundred eleven thousand, two hundred thirty-two".