256887879 has 4 divisors (see below), whose sum is σ = 342517176. Its totient is φ = 171258584.

The previous prime is 256887823. The next prime is 256887893. The reversal of 256887879 is 978788652.

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 256887879 - 2⁸ = 256887623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256887079) 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, 42814644 + ... + 42814649.

It is an arithmetic number, because the mean of its divisors is an integer number (85629294).

Almost surely, 2^256887879 is an apocalyptic number.

256887879 is a deficient number, since it is larger than the sum of its proper divisors (85629297).

256887879 is an equidigital number, since it uses as much as digits as its factorization.

256887879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85629296.

The product of its digits is 13547520, while the sum is 60.

The square root of 256887879 is about 16027.7222024840. The cubic root of 256887879 is about 635.6936467097.

The spelling of 256887879 in words is "two hundred fifty-six million, eight hundred eighty-seven thousand, eight hundred seventy-nine".