57216556 has 12 divisors (see below), whose sum is σ = 100292080. Its totient is φ = 28561680.

The previous prime is 57216553. The next prime is 57216559. The reversal of 57216556 is 65561275.

It is an interprime number because it is at equal distance from previous prime (57216553) and next prime (57216559).

It is a super-2 number, since 2×57216556² = 6547468561002272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (57216553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8811 + ... + 13858.

Almost surely, 2^57216556 is an apocalyptic number.

It is an amenable number.

57216556 is a deficient number, since it is larger than the sum of its proper divisors (43075524).

57216556 is a wasteful number, since it uses less digits than its factorization.

57216556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23304 (or 23302 counting only the distinct ones).

The product of its digits is 63000, while the sum is 37.

The square root of 57216556 is about 7564.1626106265. The cubic root of 57216556 is about 385.3368749916.

The spelling of 57216556 in words is "fifty-seven million, two hundred sixteen thousand, five hundred fifty-six".