218713668 has 12 divisors (see below), whose sum is σ = 510331920. Its totient is φ = 72904552.

The previous prime is 218713657. The next prime is 218713681. The reversal of 218713668 is 866317812.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9113058 + ... + 9113081.

It is an arithmetic number, because the mean of its divisors is an integer number (42527660).

Almost surely, 2^218713668 is an apocalyptic number.

It is an amenable number.

218713668 is an abundant number, since it is smaller than the sum of its proper divisors (291618252).

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

218713668 is a wasteful number, since it uses less digits than its factorization.

218713668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18226146 (or 18226144 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 218713668 is about 14788.9711609699. The cubic root of 218713668 is about 602.5022059916.

The spelling of 218713668 in words is "two hundred eighteen million, seven hundred thirteen thousand, six hundred sixty-eight".