216866264 has 16 divisors (see below), whose sum is σ = 424303920. Its totient is φ = 103718560.

The previous prime is 216866249. The next prime is 216866269. The reversal of 216866264 is 462668612.

216866264 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216866264² = 94061952922635392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216866269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589127 + ... + 589494.

It is an arithmetic number, because the mean of its divisors is an integer number (26518995).

Almost surely, 2^216866264 is an apocalyptic number.

It is an amenable number.

216866264 is a deficient number, since it is larger than the sum of its proper divisors (207437656).

216866264 is a wasteful number, since it uses less digits than its factorization.

216866264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178650 (or 1178646 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 216866264 is about 14726.3798674352. The cubic root of 216866264 is about 600.8010264149.

The spelling of 216866264 in words is "two hundred sixteen million, eight hundred sixty-six thousand, two hundred sixty-four".