256779 has 12 divisors (see below), whose sum is σ = 375856. Its totient is φ = 168912.

The previous prime is 256771. The next prime is 256799. The reversal of 256779 is 977652.

It is not a de Polignac number, because 256779 - 2³ = 256771 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (256771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 789 + ... + 1065.

2²⁵⁶⁷⁷⁹ is an apocalyptic number.

256779 is a deficient number, since it is larger than the sum of its proper divisors (119077).

256779 is a wasteful number, since it uses less digits than its factorization.

256779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386 (or 383 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 256779 is about 506.7336578519. The cubic root of 256779 is about 63.5603823516.

It can be divided in two parts, 256 and 779, that added together give a triangular number (1035 = T₄₅).

The spelling of 256779 in words is "two hundred fifty-six thousand, seven hundred seventy-nine".