256995215 has 8 divisors (see below), whose sum is σ = 321802848. Its totient is φ = 196657120.

The previous prime is 256995199. The next prime is 256995241. The reversal of 256995215 is 512599652.

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

It is not a de Polignac number, because 256995215 - 2⁴ = 256995199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1117256 + ... + 1117485.

It is an arithmetic number, because the mean of its divisors is an integer number (40225356).

Almost surely, 2^256995215 is an apocalyptic number.

256995215 is a deficient number, since it is larger than the sum of its proper divisors (64807633).

256995215 is a wasteful number, since it uses less digits than its factorization.

256995215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234769.

The product of its digits is 243000, while the sum is 44.

The square root of 256995215 is about 16031.0703011371. The cubic root of 256995215 is about 635.7821721168.

The spelling of 256995215 in words is "two hundred fifty-six million, nine hundred ninety-five thousand, two hundred fifteen".