215797256 has 8 divisors (see below), whose sum is σ = 404619870. Its totient is φ = 107898624.

The previous prime is 215797249. The next prime is 215797277. The reversal of 215797256 is 652797512.

215797256 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 215796100 + 1156 = 14690^2 + 34^2 .

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

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 as a sum of consecutive naturals, namely, 13487321 + ... + 13487336.

Almost surely, 2^215797256 is an apocalyptic number.

It is an amenable number.

215797256 is a deficient number, since it is larger than the sum of its proper divisors (188822614).

215797256 is a wasteful number, since it uses less digits than its factorization.

215797256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26974663 (or 26974659 counting only the distinct ones).

The product of its digits is 264600, while the sum is 44.

The square root of 215797256 is about 14690.0393464415. The cubic root of 215797256 is about 599.8122153084.

The spelling of 215797256 in words is "two hundred fifteen million, seven hundred ninety-seven thousand, two hundred fifty-six".