215816968 has 8 divisors (see below), whose sum is σ = 404656830. Its totient is φ = 107908480.

The previous prime is 215816959. The next prime is 215816969. The reversal of 215816968 is 869618512.

It can be written as a sum of positive squares in only one way, i.e., 214974244 + 842724 = 14662^2 + 918^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (215816969) by changing a digit.

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 as a sum of consecutive naturals, namely, 13488553 + ... + 13488568.

Almost surely, 2^215816968 is an apocalyptic number.

It is an amenable number.

215816968 is a deficient number, since it is larger than the sum of its proper divisors (188839862).

215816968 is a wasteful number, since it uses less digits than its factorization.

215816968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26977127 (or 26977123 counting only the distinct ones).

The product of its digits is 207360, while the sum is 46.

The square root of 215816968 is about 14690.7102619308. The cubic root of 215816968 is about 599.8304780343.

The spelling of 215816968 in words is "two hundred fifteen million, eight hundred sixteen thousand, nine hundred sixty-eight".