57172320 has 72 divisors (see below), whose sum is σ = 195105456. Its totient is φ = 15245568.

The previous prime is 57172307. The next prime is 57172331. The reversal of 57172320 is 2327175.

57172320 is a `hidden beast` number, since 571 + 72 + 3 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18412 + ... + 21291.

It is an arithmetic number, because the mean of its divisors is an integer number (2709798).

Almost surely, 2^57172320 is an apocalyptic number.

It is an amenable number.

57172320 is an abundant number, since it is smaller than the sum of its proper divisors (137933136).

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

57172320 is a wasteful number, since it uses less digits than its factorization.

57172320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39724 (or 39713 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 57172320 is about 7561.2379938738. The cubic root of 57172320 is about 385.2375438541.

Adding to 57172320 its reverse (2327175), we get a palindrome (59499495).

The spelling of 57172320 in words is "fifty-seven million, one hundred seventy-two thousand, three hundred twenty".