57281868 has 72 divisors (see below), whose sum is σ = 172693248. Its totient is φ = 15653088.

The previous prime is 57281843. The next prime is 57281899. The reversal of 57281868 is 86818275.

57281868 is a `hidden beast` number, since 572 + 8 + 18 + 68 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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, 855 + ... + 10737.

Almost surely, 2^57281868 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 57281868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86346624).

57281868 is an abundant number, since it is smaller than the sum of its proper divisors (115411380).

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

57281868 is a wasteful number, since it uses less digits than its factorization.

57281868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9923 (or 9918 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 57281868 is about 7568.4785789483. The cubic root of 57281868 is about 385.4834383514.

The spelling of 57281868 in words is "fifty-seven million, two hundred eighty-one thousand, eight hundred sixty-eight".