215630464 has 32 divisors (see below), whose sum is σ = 490946400. Its totient is φ = 92412672.

The previous prime is 215630419. The next prime is 215630473. The reversal of 215630464 is 464036512.

It is a tau number, because it is divible by the number of its divisors (32).

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, 119434 + ... + 121225.

It is an arithmetic number, because the mean of its divisors is an integer number (15342075).

Almost surely, 2^215630464 is an apocalyptic number.

It is an amenable number.

215630464 is an abundant number, since it is smaller than the sum of its proper divisors (275315936).

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

215630464 is an equidigital number, since it uses as much as digits as its factorization.

215630464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240680 (or 240668 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 215630464 is about 14684.3612050371. The cubic root of 215630464 is about 599.6576417255.

Adding to 215630464 its reverse (464036512), we get a palindrome (679666976).

The spelling of 215630464 in words is "two hundred fifteen million, six hundred thirty thousand, four hundred sixty-four".