57239988 has 24 divisors (see below), whose sum is σ = 143834208. Its totient is φ = 17612256.

The previous prime is 57239953. The next prime is 57239993. The reversal of 57239988 is 88993275.

It is a self number, because there is not a number n which added to its sum of digits gives 57239988.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183306 + ... + 183617.

It is an arithmetic number, because the mean of its divisors is an integer number (5993092).

Almost surely, 2^57239988 is an apocalyptic number.

It is an amenable number.

57239988 is an abundant number, since it is smaller than the sum of its proper divisors (86594220).

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

57239988 is a wasteful number, since it uses less digits than its factorization.

57239988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366943 (or 366941 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 57239988 is about 7565.7113346995. The cubic root of 57239988 is about 385.3894703823.

The spelling of 57239988 in words is "fifty-seven million, two hundred thirty-nine thousand, nine hundred eighty-eight".