256763128 has 16 divisors (see below), whose sum is σ = 494443080. Its totient is φ = 124911648.

The previous prime is 256763123. The next prime is 256763141. The reversal of 256763128 is 821367652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256763123) 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 3 ways as a sum of consecutive naturals, for example, 433426 + ... + 434017.

Almost surely, 2^256763128 is an apocalyptic number.

It is an amenable number.

256763128 is a deficient number, since it is larger than the sum of its proper divisors (237679952).

256763128 is a wasteful number, since it uses less digits than its factorization.

256763128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867486 (or 867482 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 256763128 is about 16023.8300040908. The cubic root of 256763128 is about 635.5907272842.

The spelling of 256763128 in words is "two hundred fifty-six million, seven hundred sixty-three thousand, one hundred twenty-eight".