57216388 has 6 divisors (see below), whose sum is σ = 100128686. Its totient is φ = 28608192.

The previous prime is 57216349. The next prime is 57216403. The reversal of 57216388 is 88361275.

It can be written as a sum of positive squares in only one way, i.e., 42224004 + 14992384 = 6498^2 + 3872^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 57216388.

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, 7152045 + ... + 7152052.

Almost surely, 2^57216388 is an apocalyptic number.

It is an amenable number.

57216388 is a deficient number, since it is larger than the sum of its proper divisors (42912298).

57216388 is a wasteful number, since it uses less digits than its factorization.

57216388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14304101 (or 14304099 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 57216388 is about 7564.1515056218. The cubic root of 57216388 is about 385.3364978475.

The spelling of 57216388 in words is "fifty-seven million, two hundred sixteen thousand, three hundred eighty-eight".