57211816 has 16 divisors (see below), whose sum is σ = 107595540. Its totient is φ = 28519680.

The previous prime is 57211813. The next prime is 57211823. The reversal of 57211816 is 61811275.

It can be written as a sum of positive squares in 2 ways, for example, as 55442916 + 1768900 = 7446^2 + 1330^2 .

It is not an unprimeable number, because it can be changed into a prime (57211813) 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, 7915 + ... + 13306.

Almost surely, 2^57211816 is an apocalyptic number.

It is an amenable number.

57211816 is a deficient number, since it is larger than the sum of its proper divisors (50383724).

57211816 is a wasteful number, since it uses less digits than its factorization.

57211816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21564 (or 21560 counting only the distinct ones).

The product of its digits is 3360, while the sum is 31.

The square root of 57211816 is about 7563.8492845905. The cubic root of 57211816 is about 385.3262338569.

The spelling of 57211816 in words is "fifty-seven million, two hundred eleven thousand, eight hundred sixteen".