215130256 has 30 divisors (see below), whose sum is σ = 458156006. Its totient is φ = 97785600.

The previous prime is 215130203. The next prime is 215130259. The reversal of 215130256 is 652031512.

It can be written as a sum of positive squares in only one way, i.e., 187251856 + 27878400 = 13684^2 + 5280^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 215130256.

It is not an unprimeable number, because it can be changed into a prime (215130259) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53625 + ... + 57496.

Almost surely, 2^215130256 is an apocalyptic number.

It is an amenable number.

215130256 is an abundant number, since it is smaller than the sum of its proper divisors (243025750).

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

215130256 is a wasteful number, since it uses less digits than its factorization.

215130256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111151 (or 111134 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 215130256 is about 14667.3193188121. The cubic root of 215130256 is about 599.1935981605.

Adding to 215130256 its reverse (652031512), we get a palindrome (867161768).

The spelling of 215130256 in words is "two hundred fifteen million, one hundred thirty thousand, two hundred fifty-six".