57391440 has 160 divisors (see below), whose sum is σ = 191344896. Its totient is φ = 14192640.

The previous prime is 57391393. The next prime is 57391459. The reversal of 57391440 is 4419375.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204100 + ... + 204380.

Almost surely, 2^57391440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57391440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95672448).

57391440 is an abundant number, since it is smaller than the sum of its proper divisors (133953456).

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

57391440 is a wasteful number, since it uses less digits than its factorization.

57391440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 57391440 is about 7575.7138277525. The cubic root of 57391440 is about 385.7290733112.

The spelling of 57391440 in words is "fifty-seven million, three hundred ninety-one thousand, four hundred forty".