218860664 has 32 divisors (see below), whose sum is σ = 451796400. Its totient is φ = 98565120.

The previous prime is 218860633. The next prime is 218860667. The reversal of 218860664 is 466068812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218860667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1817 + ... + 21000.

Almost surely, 2^218860664 is an apocalyptic number.

It is an amenable number.

218860664 is an abundant number, since it is smaller than the sum of its proper divisors (232935736).

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

218860664 is a wasteful number, since it uses less digits than its factorization.

218860664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22943 (or 22939 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 218860664 is about 14793.9401107345. The cubic root of 218860664 is about 602.6371550037.

The spelling of 218860664 in words is "two hundred eighteen million, eight hundred sixty thousand, six hundred sixty-four".