256615315 has 8 divisors (see below), whose sum is σ = 335932848. Its totient is φ = 186629280.

The previous prime is 256615291. The next prime is 256615319. The reversal of 256615315 is 513516652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256615315 - 2⁵ = 256615283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256615319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2332812 + ... + 2332921.

It is an arithmetic number, because the mean of its divisors is an integer number (41991606).

Almost surely, 2^256615315 is an apocalyptic number.

256615315 is a deficient number, since it is larger than the sum of its proper divisors (79317533).

256615315 is a wasteful number, since it uses less digits than its factorization.

256615315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4665749.

The product of its digits is 27000, while the sum is 34.

The square root of 256615315 is about 16019.2170532770. The cubic root of 256615315 is about 635.4687385771.

It can be divided in two parts, 25661 and 5315, that added together give a square (30976 = 176²).

The spelling of 256615315 in words is "two hundred fifty-six million, six hundred fifteen thousand, three hundred fifteen".