256705879 has 4 divisors (see below), whose sum is σ = 262967040. Its totient is φ = 250444720.

The previous prime is 256705859. The next prime is 256705909. The reversal of 256705879 is 978507652.

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 256705879 - 2¹⁵ = 256673111 is a prime.

It is a super-3 number, since 3×256705879³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256705819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3130519 + ... + 3130600.

It is an arithmetic number, because the mean of its divisors is an integer number (65741760).

Almost surely, 2^256705879 is an apocalyptic number.

256705879 is a deficient number, since it is larger than the sum of its proper divisors (6261161).

256705879 is an equidigital number, since it uses as much as digits as its factorization.

256705879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6261160.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The square root of 256705879 is about 16022.0435338318. The cubic root of 256705879 is about 635.5434857682.

The spelling of 256705879 in words is "two hundred fifty-six million, seven hundred five thousand, eight hundred seventy-nine".