256403044 has 48 divisors (see below), whose sum is σ = 493259760. Its totient is φ = 116121600.

The previous prime is 256403039. The next prime is 256403051. The reversal of 256403044 is 440304652.

It can be written as a sum of positive squares in 8 ways, for example, as 74476900 + 181926144 = 8630^2 + 13488^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253612 + ... + 254620.

It is an arithmetic number, because the mean of its divisors is an integer number (10276245).

Almost surely, 2^256403044 is an apocalyptic number.

It is an amenable number.

256403044 is a deficient number, since it is larger than the sum of its proper divisors (236856716).

256403044 is a wasteful number, since it uses less digits than its factorization.

256403044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168 (or 1166 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 256403044 is about 16012.5901714869. The cubic root of 256403044 is about 635.2934713091.

Adding to 256403044 its reverse (440304652), we get a palindrome (696707696).

The spelling of 256403044 in words is "two hundred fifty-six million, four hundred three thousand, forty-four".