57216840 has 64 divisors (see below), whose sum is σ = 172186560. Its totient is φ = 15210240.

The previous prime is 57216829. The next prime is 57216851. The reversal of 57216840 is 4861275.

It is an interprime number because it is at equal distance from previous prime (57216829) and next prime (57216851).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55530 + ... + 56550.

It is an arithmetic number, because the mean of its divisors is an integer number (2690415).

Almost surely, 2^57216840 is an apocalyptic number.

It is an amenable number.

57216840 is an abundant number, since it is smaller than the sum of its proper divisors (114969720).

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

57216840 is a wasteful number, since it uses less digits than its factorization.

57216840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502 (or 1498 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 57216840 is about 7564.1813833355. The cubic root of 57216840 is about 385.3375125430.

It can be divided in two parts, 5721 and 6840, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 57216840 in words is "fifty-seven million, two hundred sixteen thousand, eight hundred forty".