57221664 has 24 divisors (see below), whose sum is σ = 150207120. Its totient is φ = 19073856.

The previous prime is 57221663. The next prime is 57221687. The reversal of 57221664 is 46612275.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (57221663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297934 + ... + 298125.

It is an arithmetic number, because the mean of its divisors is an integer number (6258630).

Almost surely, 2^57221664 is an apocalyptic number.

It is an amenable number.

57221664 is an abundant number, since it is smaller than the sum of its proper divisors (92985456).

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

57221664 is a wasteful number, since it uses less digits than its factorization.

57221664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596072 (or 596064 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 57221664 is about 7564.5002478683. The cubic root of 57221664 is about 385.3483416155.

The spelling of 57221664 in words is "fifty-seven million, two hundred twenty-one thousand, six hundred sixty-four".