216864915 has 16 divisors (see below), whose sum is σ = 347186688. Its totient is φ = 115593696.

The previous prime is 216864899. The next prime is 216864961. The reversal of 216864915 is 519468612.

216864915 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216864915 - 2⁴ = 216864899 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32712 + ... + 38778.

It is an arithmetic number, because the mean of its divisors is an integer number (21699168).

Almost surely, 2^216864915 is an apocalyptic number.

216864915 is a deficient number, since it is larger than the sum of its proper divisors (130321773).

216864915 is a wasteful number, since it uses less digits than its factorization.

216864915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8458.

The product of its digits is 103680, while the sum is 42.

The square root of 216864915 is about 14726.3340652044. The cubic root of 216864915 is about 600.7997806667.

The spelling of 216864915 in words is "two hundred sixteen million, eight hundred sixty-four thousand, nine hundred fifteen".