215316256 has 24 divisors (see below), whose sum is σ = 434245644. Its totient is φ = 105031680.

The previous prime is 215316253. The next prime is 215316287. The reversal of 215316256 is 652613512.

215316256 is digitally balanced in base 2, 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 2 ways, for example, as 204947856 + 10368400 = 14316^2 + 3220^2 .

It is a super-2 number, since 2×215316256² = 92722180195715072, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (215316251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80745 + ... + 83368.

Almost surely, 2^215316256 is an apocalyptic number.

It is an amenable number.

215316256 is an abundant number, since it is smaller than the sum of its proper divisors (218929388).

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

215316256 is a wasteful number, since it uses less digits than its factorization.

215316256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164164 (or 164156 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 215316256 is about 14673.6585758290. The cubic root of 215316256 is about 599.3662345082.

Adding to 215316256 its reverse (652613512), we get a palindrome (867929768).

The spelling of 215316256 in words is "two hundred fifteen million, three hundred sixteen thousand, two hundred fifty-six".