57218172 has 24 divisors (see below), whose sum is σ = 145646592. Its totient is φ = 17338800.

The previous prime is 57218167. The next prime is 57218173. The reversal of 57218172 is 27181275.

57218172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57218173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216604 + ... + 216867.

It is an arithmetic number, because the mean of its divisors is an integer number (6068608).

Almost surely, 2^57218172 is an apocalyptic number.

It is an amenable number.

57218172 is an abundant number, since it is smaller than the sum of its proper divisors (88428420).

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

57218172 is a wasteful number, since it uses less digits than its factorization.

57218172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433489 (or 433487 counting only the distinct ones).

The product of its digits is 7840, while the sum is 33.

The square root of 57218172 is about 7564.2694293633. The cubic root of 57218172 is about 385.3405027208.

The spelling of 57218172 in words is "fifty-seven million, two hundred eighteen thousand, one hundred seventy-two".