57717990 has 96 divisors (see below), whose sum is σ = 165144096. Its totient is φ = 13870080.

The previous prime is 57717983. The next prime is 57718049. The reversal of 57717990 is 9971775.

57717990 is a `hidden beast` number, since 577 + 1 + 79 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 171102 + ... + 171438.

It is an arithmetic number, because the mean of its divisors is an integer number (1720251).

Almost surely, 2^57717990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57717990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82572048).

57717990 is an abundant number, since it is smaller than the sum of its proper divisors (107426106).

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

57717990 is a wasteful number, since it uses less digits than its factorization.

57717990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 138915, while the sum is 45.

The square root of 57717990 is about 7597.2356814831. The cubic root of 57717990 is about 386.4592732779.

The spelling of 57717990 in words is "fifty-seven million, seven hundred seventeen thousand, nine hundred ninety".