215564664 has 64 divisors (see below), whose sum is σ = 632563200. Its totient is φ = 59923584.

The previous prime is 215564653. The next prime is 215564681. The reversal of 215564664 is 466465512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11124 + ... + 23555.

It is an arithmetic number, because the mean of its divisors is an integer number (9883800).

Almost surely, 2^215564664 is an apocalyptic number.

215564664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

215564664 is an abundant number, since it is smaller than the sum of its proper divisors (416998536).

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

215564664 is a wasteful number, since it uses less digits than its factorization.

215564664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34732 (or 34728 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The square root of 215564664 is about 14682.1205552876. The cubic root of 215564664 is about 599.5966400064.

The spelling of 215564664 in words is "two hundred fifteen million, five hundred sixty-four thousand, six hundred sixty-four".