216844664 has 32 divisors (see below), whose sum is σ = 414916320. Its totient is φ = 106223616.

The previous prime is 216844637. The next prime is 216844681. The reversal of 216844664 is 466448612.

216844664 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78572 + ... + 81284.

It is an arithmetic number, because the mean of its divisors is an integer number (12966135).

Almost surely, 2^216844664 is an apocalyptic number.

It is an amenable number.

216844664 is a deficient number, since it is larger than the sum of its proper divisors (198071656).

216844664 is a wasteful number, since it uses less digits than its factorization.

216844664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2919 (or 2915 counting only the distinct ones).

The product of its digits is 221184, while the sum is 41.

The square root of 216844664 is about 14725.6464713778. The cubic root of 216844664 is about 600.7810790476.

The spelling of 216844664 in words is "two hundred sixteen million, eight hundred forty-four thousand, six hundred sixty-four".