216637068 has 12 divisors (see below), whose sum is σ = 505486520. Its totient is φ = 72212352.

The previous prime is 216637067. The next prime is 216637087. The reversal of 216637068 is 860736612.

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

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (216637067) 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, 9026533 + ... + 9026556.

Almost surely, 2^216637068 is an apocalyptic number.

It is an amenable number.

216637068 is an abundant number, since it is smaller than the sum of its proper divisors (288849452).

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

216637068 is a wasteful number, since it uses less digits than its factorization.

216637068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18053096 (or 18053094 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 216637068 is about 14718.5959928249. The cubic root of 216637068 is about 600.5892987998.

The spelling of 216637068 in words is "two hundred sixteen million, six hundred thirty-seven thousand, sixty-eight".