57218 has 16 divisors (see below), whose sum is σ = 101184. Its totient is φ = 23760.

The previous prime is 57203. The next prime is 57221. The reversal of 57218 is 81275.

It is a junction number, because it is equal to n+sod(n) for n = 57193 and 57202.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 821 + ... + 887.

It is an arithmetic number, because the mean of its divisors is an integer number (6324).

2⁵⁷²¹⁸ is an apocalyptic number.

57218 is a deficient number, since it is larger than the sum of its proper divisors (43966).

57218 is a wasteful number, since it uses less digits than its factorization.

57218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137.

The product of its digits is 560, while the sum is 23.

The square root of 57218 is about 239.2028427925. The cubic root of 57218 is about 38.5340116604.

It can be divided in two parts, 572 and 18, that multiplied together give a triangular number (10296 = T₁₄₃).

The spelling of 57218 in words is "fifty-seven thousand, two hundred eighteen".