256745779 has 4 divisors (see below), whose sum is σ = 256793776. Its totient is φ = 256697784.

The previous prime is 256745771. The next prime is 256745789. The reversal of 256745779 is 977547652.

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 256745779 - 2³ = 256745771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256745771) 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, 14799 + ... + 27064.

It is an arithmetic number, because the mean of its divisors is an integer number (64198444).

Almost surely, 2^256745779 is an apocalyptic number.

256745779 is a deficient number, since it is larger than the sum of its proper divisors (47997).

256745779 is an equidigital number, since it uses as much as digits as its factorization.

256745779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47996.

The product of its digits is 3704400, while the sum is 52.

The square root of 256745779 is about 16023.2886449692. The cubic root of 256745779 is about 635.5764117398.

The spelling of 256745779 in words is "two hundred fifty-six million, seven hundred forty-five thousand, seven hundred seventy-nine".