57216518 has 4 divisors (see below), whose sum is σ = 85824780. Its totient is φ = 28608258.

The previous prime is 57216503. The next prime is 57216527. The reversal of 57216518 is 81561275.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14304128 + ... + 14304131.

It is an arithmetic number, because the mean of its divisors is an integer number (21456195).

Almost surely, 2^57216518 is an apocalyptic number.

57216518 is a deficient number, since it is larger than the sum of its proper divisors (28608262).

57216518 is a wasteful number, since it uses less digits than its factorization.

57216518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28608261.

The product of its digits is 16800, while the sum is 35.

The square root of 57216518 is about 7564.1600987816. The cubic root of 57216518 is about 385.3367896852.

The spelling of 57216518 in words is "fifty-seven million, two hundred sixteen thousand, five hundred eighteen".