57209904 has 120 divisors (see below), whose sum is σ = 167132160. Its totient is φ = 18255744.

The previous prime is 57209899. The next prime is 57209923. The reversal of 57209904 is 40990275.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 534619 + ... + 534725.

It is an arithmetic number, because the mean of its divisors is an integer number (1392768).

Almost surely, 2^57209904 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 57209904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83566080).

57209904 is an abundant number, since it is smaller than the sum of its proper divisors (109922256).

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

57209904 is a wasteful number, since it uses less digits than its factorization.

57209904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 57209904 is about 7563.7228928617. The cubic root of 57209904 is about 385.3219413173.

The spelling of 57209904 in words is "fifty-seven million, two hundred nine thousand, nine hundred four".