57391840 has 48 divisors (see below), whose sum is σ = 147918960. Its totient is φ = 20869120.

The previous prime is 57391801. The next prime is 57391843. The reversal of 57391840 is 4819375.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 57391840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57391843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14545 + ... + 18064.

It is an arithmetic number, because the mean of its divisors is an integer number (3081645).

Almost surely, 2^57391840 is an apocalyptic number.

It is an amenable number.

57391840 is an abundant number, since it is smaller than the sum of its proper divisors (90527120).

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

57391840 is a wasteful number, since it uses less digits than its factorization.

57391840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32635 (or 32627 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 57391840 is about 7575.7402278589. The cubic root of 57391840 is about 385.7299694452.

The spelling of 57391840 in words is "fifty-seven million, three hundred ninety-one thousand, eight hundred forty".