57221772 has 12 divisors (see below), whose sum is σ = 133517496. Its totient is φ = 19073920.

The previous prime is 57221761. The next prime is 57221789. The reversal of 57221772 is 27712275.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 2384229 + ... + 2384252.

It is an arithmetic number, because the mean of its divisors is an integer number (11126458).

Almost surely, 2^57221772 is an apocalyptic number.

It is an amenable number.

57221772 is an abundant number, since it is smaller than the sum of its proper divisors (76295724).

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

57221772 is a wasteful number, since it uses less digits than its factorization.

57221772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4768488 (or 4768486 counting only the distinct ones).

The product of its digits is 13720, while the sum is 33.

The square root of 57221772 is about 7564.5073864727. The cubic root of 57221772 is about 385.3485840504.

The spelling of 57221772 in words is "fifty-seven million, two hundred twenty-one thousand, seven hundred seventy-two".