218564252 has 12 divisors (see below), whose sum is σ = 384130656. Its totient is φ = 108812640.

The previous prime is 218564237. The next prime is 218564267. The reversal of 218564252 is 252465812.

It is an interprime number because it is at equal distance from previous prime (218564237) and next prime (218564267).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116324 + ... + 118187.

It is an arithmetic number, because the mean of its divisors is an integer number (32010888).

Almost surely, 2^218564252 is an apocalyptic number.

It is an amenable number.

218564252 is a deficient number, since it is larger than the sum of its proper divisors (165566404).

218564252 is a wasteful number, since it uses less digits than its factorization.

218564252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234748 (or 234746 counting only the distinct ones).

The product of its digits is 38400, while the sum is 35.

The square root of 218564252 is about 14783.9186956639. The cubic root of 218564252 is about 602.3649733283.

The spelling of 218564252 in words is "two hundred eighteen million, five hundred sixty-four thousand, two hundred fifty-two".