256486579 has 4 divisors (see below), whose sum is σ = 257393176. Its totient is φ = 255579984.

The previous prime is 256486561. The next prime is 256486613. The reversal of 256486579 is 975684652.

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 256486579 - 2²⁵ = 222932147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256487579) 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, 452874 + ... + 453439.

It is an arithmetic number, because the mean of its divisors is an integer number (64348294).

Almost surely, 2^256486579 is an apocalyptic number.

256486579 is a deficient number, since it is larger than the sum of its proper divisors (906597).

256486579 is an equidigital number, since it uses as much as digits as its factorization.

256486579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906596.

The product of its digits is 3628800, while the sum is 52.

The square root of 256486579 is about 16015.1983752934. The cubic root of 256486579 is about 635.3624557708.

The spelling of 256486579 in words is "two hundred fifty-six million, four hundred eighty-six thousand, five hundred seventy-nine".