256087855 has 4 divisors (see below), whose sum is σ = 307305432. Its totient is φ = 204870280.

The previous prime is 256087831. The next prime is 256087859. The reversal of 256087855 is 558780652.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 256087855 - 2²³ = 247699247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256087859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25608781 + ... + 25608790.

It is an arithmetic number, because the mean of its divisors is an integer number (76826358).

Almost surely, 2^256087855 is an apocalyptic number.

256087855 is a deficient number, since it is larger than the sum of its proper divisors (51217577).

256087855 is an equidigital number, since it uses as much as digits as its factorization.

256087855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51217576.

The product of its (nonzero) digits is 672000, while the sum is 46.

The square root of 256087855 is about 16002.7452332405. The cubic root of 256087855 is about 635.0330484794.

The spelling of 256087855 in words is "two hundred fifty-six million, eighty-seven thousand, eight hundred fifty-five".