57216816 has 60 divisors (see below), whose sum is σ = 162350968. Its totient is φ = 18807552.

The previous prime is 57216811. The next prime is 57216823. The reversal of 57216816 is 61861275.

57216816 is a `hidden beast` number, since 572 + 1 + 6 + 81 + 6 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (57216811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7791 + ... + 13233.

Almost surely, 2^57216816 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 57216816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81175484).

57216816 is an abundant number, since it is smaller than the sum of its proper divisors (105134152).

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

57216816 is a wasteful number, since it uses less digits than its factorization.

57216816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530 (or 5521 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 57216816 is about 7564.1797969112. The cubic root of 57216816 is about 385.3374586655.

The spelling of 57216816 in words is "fifty-seven million, two hundred sixteen thousand, eight hundred sixteen".