216688204 has 6 divisors (see below), whose sum is σ = 379204364. Its totient is φ = 108344100.

The previous prime is 216688201. The next prime is 216688247. The reversal of 216688204 is 402886612.

216688204 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (216688201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27086022 + ... + 27086029.

Almost surely, 2^216688204 is an apocalyptic number.

It is an amenable number.

216688204 is a deficient number, since it is larger than the sum of its proper divisors (162516160).

216688204 is a wasteful number, since it uses less digits than its factorization.

216688204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54172055 (or 54172053 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 216688204 is about 14720.3330125375. Note that the first 3 decimals coincide. The cubic root of 216688204 is about 600.6365503598.

The spelling of 216688204 in words is "two hundred sixteen million, six hundred eighty-eight thousand, two hundred four".