216623264 has 48 divisors (see below), whose sum is σ = 501046560. Its totient is φ = 90888960.

The previous prime is 216623249. The next prime is 216623273. The reversal of 216623264 is 462326612.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 216623264.

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, 19094 + ... + 28245.

It is an arithmetic number, because the mean of its divisors is an integer number (10438470).

Almost surely, 2^216623264 is an apocalyptic number.

It is an amenable number.

216623264 is an abundant number, since it is smaller than the sum of its proper divisors (284423296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216623264 is a wasteful number, since it uses less digits than its factorization.

216623264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47373 (or 47365 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

The square root of 216623264 is about 14718.1270547580. The cubic root of 216623264 is about 600.5765421175.

Adding to 216623264 its reverse (462326612), we get a palindrome (678949876).

The spelling of 216623264 in words is "two hundred sixteen million, six hundred twenty-three thousand, two hundred sixty-four".