256764459 has 12 divisors (see below), whose sum is σ = 398247144. Its totient is φ = 146722464.

The previous prime is 256764451. The next prime is 256764493. The reversal of 256764459 is 954467652.

It is not a de Polignac number, because 256764459 - 2³ = 256764451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256764451) 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 11 ways as a sum of consecutive naturals, for example, 873202 + ... + 873495.

It is an arithmetic number, because the mean of its divisors is an integer number (33187262).

Almost surely, 2^256764459 is an apocalyptic number.

256764459 is a deficient number, since it is larger than the sum of its proper divisors (141482685).

256764459 is a wasteful number, since it uses less digits than its factorization.

256764459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746714 (or 1746707 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 48.

The square root of 256764459 is about 16023.8715359304. The cubic root of 256764459 is about 635.5918255335.

It can be divided in two parts, 25676 and 4459, that added together give a triangular number (30135 = T₂₄₅).

The spelling of 256764459 in words is "two hundred fifty-six million, seven hundred sixty-four thousand, four hundred fifty-nine".