256744255 has 8 divisors (see below), whose sum is σ = 315607824. Its totient is φ = 200385600.

The previous prime is 256744247. The next prime is 256744261. The reversal of 256744255 is 552447652.

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

It is not a de Polignac number, because 256744255 - 2³ = 256744247 is a prime.

It is a super-2 number, since 2×256744255² = 131835224951010050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 626001 + ... + 626410.

It is an arithmetic number, because the mean of its divisors is an integer number (39450978).

Almost surely, 2^256744255 is an apocalyptic number.

256744255 is a deficient number, since it is larger than the sum of its proper divisors (58863569).

256744255 is a wasteful number, since it uses less digits than its factorization.

256744255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252457.

The product of its digits is 336000, while the sum is 40.

The square root of 256744255 is about 16023.2410891180. The cubic root of 256744255 is about 635.5751541788.

It can be divided in two parts, 25674 and 4255, that added together give a square (29929 = 173²).

The spelling of 256744255 in words is "two hundred fifty-six million, seven hundred forty-four thousand, two hundred fifty-five".