216938636 has 24 divisors (see below), whose sum is σ = 384493200. Its totient is φ = 107092800.

The previous prime is 216938609. The next prime is 216938639. The reversal of 216938636 is 636839612.

216938636 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 (216938639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106871 + ... + 108881.

It is an arithmetic number, because the mean of its divisors is an integer number (16020550).

Almost surely, 2^216938636 is an apocalyptic number.

It is an amenable number.

216938636 is a deficient number, since it is larger than the sum of its proper divisors (167554564).

216938636 is a wasteful number, since it uses less digits than its factorization.

216938636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2345 (or 2343 counting only the distinct ones).

The product of its digits is 279936, while the sum is 44.

The square root of 216938636 is about 14728.8368855114. The cubic root of 216938636 is about 600.8678515251.

The spelling of 216938636 in words is "two hundred sixteen million, nine hundred thirty-eight thousand, six hundred thirty-six".