215913668 has 24 divisors (see below), whose sum is σ = 400692600. Its totient is φ = 101449728.

The previous prime is 215913653. The next prime is 215913683. The reversal of 215913668 is 866319512.

215913668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (215913653) and next prime (215913683).

It can be written as a sum of positive squares in 4 ways, for example, as 51868804 + 164044864 = 7202^2 + 12808^2 .

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, 50228 + ... + 54356.

It is an arithmetic number, because the mean of its divisors is an integer number (16695525).

Almost surely, 2^215913668 is an apocalyptic number.

It is an amenable number.

215913668 is a deficient number, since it is larger than the sum of its proper divisors (184778932).

215913668 is a wasteful number, since it uses less digits than its factorization.

215913668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4919 (or 4917 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 215913668 is about 14694.0010888798. The cubic root of 215913668 is about 599.9200523107.

The spelling of 215913668 in words is "two hundred fifteen million, nine hundred thirteen thousand, six hundred sixty-eight".