216788168 has 8 divisors (see below), whose sum is σ = 406477830. Its totient is φ = 108394080.

The previous prime is 216788167. The next prime is 216788183. The reversal of 216788168 is 861887612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 212634724 + 4153444 = 14582^2 + 2038^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (216788167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13549253 + ... + 13549268.

Almost surely, 2^216788168 is an apocalyptic number.

It is an amenable number.

216788168 is a deficient number, since it is larger than the sum of its proper divisors (189689662).

216788168 is a wasteful number, since it uses less digits than its factorization.

216788168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27098527 (or 27098523 counting only the distinct ones).

The product of its digits is 258048, while the sum is 47.

The square root of 216788168 is about 14723.7280605151. The cubic root of 216788168 is about 600.7288993362.

The spelling of 216788168 in words is "two hundred sixteen million, seven hundred eighty-eight thousand, one hundred sixty-eight".