216708788 has 12 divisors (see below), whose sum is σ = 380218020. Its totient is φ = 108075072.

The previous prime is 216708761. The next prime is 216708797. The reversal of 216708788 is 887807612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 154803364 + 61905424 = 12442^2 + 7868^2 .

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

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, 68081 + ... + 71192.

It is an arithmetic number, because the mean of its divisors is an integer number (31684835).

Almost surely, 2^216708788 is an apocalyptic number.

It is an amenable number.

216708788 is a deficient number, since it is larger than the sum of its proper divisors (163509232).

216708788 is a wasteful number, since it uses less digits than its factorization.

216708788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139666 (or 139664 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 47.

The square root of 216708788 is about 14721.0321648993. The cubic root of 216708788 is about 600.6555686406.

The spelling of 216708788 in words is "two hundred sixteen million, seven hundred eight thousand, seven hundred eighty-eight".