256744887 has 16 divisors (see below), whose sum is σ = 401805312. Its totient is φ = 142745760.

The previous prime is 256744861. The next prime is 256744889. The reversal of 256744887 is 788447652.

It is not a de Polignac number, because 256744887 - 2¹⁹ = 256220599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256744889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164439 + ... + 165992.

It is an arithmetic number, because the mean of its divisors is an integer number (25112832).

Almost surely, 2^256744887 is an apocalyptic number.

256744887 is a deficient number, since it is larger than the sum of its proper divisors (145060425).

256744887 is a wasteful number, since it uses less digits than its factorization.

256744887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330478.

The product of its digits is 3010560, while the sum is 51.

The square root of 256744887 is about 16023.2608104593. The cubic root of 256744887 is about 635.5756756877.

The spelling of 256744887 in words is "two hundred fifty-six million, seven hundred forty-four thousand, eight hundred eighty-seven".