215630664 has 16 divisors (see below), whose sum is σ = 539076720. Its totient is φ = 71876880.

The previous prime is 215630651. The next prime is 215630707. The reversal of 215630664 is 466036512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4492282 + ... + 4492329.

It is an arithmetic number, because the mean of its divisors is an integer number (33692295).

Almost surely, 2^215630664 is an apocalyptic number.

215630664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

215630664 is an abundant number, since it is smaller than the sum of its proper divisors (323446056).

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

215630664 is a wasteful number, since it uses less digits than its factorization.

215630664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8984620 (or 8984616 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 215630664 is about 14684.3680150015. The cubic root of 215630664 is about 599.6578271222.

The spelling of 215630664 in words is "two hundred fifteen million, six hundred thirty thousand, six hundred sixty-four".