57218112 has 168 divisors, whose sum is σ = 195901056. Its totient is φ = 15611904.

The previous prime is 57218093. The next prime is 57218113. The reversal of 57218112 is 21181275.

57218112 is a `hidden beast` number, since 572 + 1 + 81 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is not an unprimeable number, because it can be changed into a prime (57218113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92428 + ... + 93044.

Almost surely, 2^57218112 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 57218112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97950528).

57218112 is an abundant number, since it is smaller than the sum of its proper divisors (138682944).

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

57218112 is a wasteful number, since it uses less digits than its factorization.

57218112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 652 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 57218112 is about 7564.2654633480. The cubic root of 57218112 is about 385.3403680291.

Adding to 57218112 its reverse (21181275), we get a palindrome (78399387).

The spelling of 57218112 in words is "fifty-seven million, two hundred eighteen thousand, one hundred twelve".