256587995 has 4 divisors (see below), whose sum is σ = 307905600. Its totient is φ = 205270392.

The previous prime is 256587973. The next prime is 256588043. The reversal of 256587995 is 599785652.

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

It is a cyclic number.

It is not a de Polignac number, because 256587995 - 2¹⁸ = 256325851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256587995.

It is an unprimeable number.

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, 25658795 + ... + 25658804.

It is an arithmetic number, because the mean of its divisors is an integer number (76976400).

Almost surely, 2^256587995 is an apocalyptic number.

256587995 is a deficient number, since it is larger than the sum of its proper divisors (51317605).

256587995 is an equidigital number, since it uses as much as digits as its factorization.

256587995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51317604.

The product of its digits is 6804000, while the sum is 56.

The square root of 256587995 is about 16018.3643047597. The cubic root of 256587995 is about 635.4461865040.

The spelling of 256587995 in words is "two hundred fifty-six million, five hundred eighty-seven thousand, nine hundred ninety-five".