57189720 has 128 divisors (see below), whose sum is σ = 198282240. Its totient is φ = 12925440.

The previous prime is 57189701. The next prime is 57189731. The reversal of 57189720 is 2798175.

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, 86190 + ... + 86850.

It is an arithmetic number, because the mean of its divisors is an integer number (1549080).

Almost surely, 2^57189720 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 57189720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99141120).

57189720 is an abundant number, since it is smaller than the sum of its proper divisors (141092520).

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

57189720 is a wasteful number, since it uses less digits than its factorization.

57189720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 57189720 is about 7562.3885115749. The cubic root of 57189720 is about 385.2766213503.

The spelling of 57189720 in words is "fifty-seven million, one hundred eighty-nine thousand, seven hundred twenty".