57721132 has 24 divisors (see below), whose sum is σ = 119168000. Its totient is φ = 23939280.

The previous prime is 57721127. The next prime is 57721177. The reversal of 57721132 is 23112775.

It is a super-2 number, since 2×57721132² = 6663458158722848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 57721132.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32382 + ... + 34117.

Almost surely, 2^57721132 is an apocalyptic number.

It is an amenable number.

57721132 is an abundant number, since it is smaller than the sum of its proper divisors (61446868).

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

57721132 is a wasteful number, since it uses less digits than its factorization.

57721132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66541 (or 66539 counting only the distinct ones).

The product of its digits is 2940, while the sum is 28.

The square root of 57721132 is about 7597.4424644087. The cubic root of 57721132 is about 386.4662857247.

The spelling of 57721132 in words is "fifty-seven million, seven hundred twenty-one thousand, one hundred thirty-two".