216870688 has 12 divisors (see below), whose sum is σ = 426964230. Its totient is φ = 108435328.

The previous prime is 216870623. The next prime is 216870691. The reversal of 216870688 is 886078612.

216870688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 111767184 + 105103504 = 10572^2 + 10252^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3388573 + ... + 3388636.

Almost surely, 2^216870688 is an apocalyptic number.

It is an amenable number.

216870688 is a deficient number, since it is larger than the sum of its proper divisors (210093542).

216870688 is an equidigital number, since it uses as much as digits as its factorization.

216870688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6777219 (or 6777211 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 216870688 is about 14726.5300733065. The cubic root of 216870688 is about 600.8051117678.

The spelling of 216870688 in words is "two hundred sixteen million, eight hundred seventy thousand, six hundred eighty-eight".