256791128 has 32 divisors (see below), whose sum is σ = 534168000. Its totient is φ = 114742560.

The previous prime is 256791121. The next prime is 256791131. The reversal of 256791128 is 821197652.

256791128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256791121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19538 + ... + 29921.

It is an arithmetic number, because the mean of its divisors is an integer number (16692750).

Almost surely, 2^256791128 is an apocalyptic number.

It is an amenable number.

256791128 is an abundant number, since it is smaller than the sum of its proper divisors (277376872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256791128 is a wasteful number, since it uses less digits than its factorization.

256791128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49535 (or 49531 counting only the distinct ones).

The product of its digits is 60480, while the sum is 41.

The square root of 256791128 is about 16024.7036790076. The cubic root of 256791128 is about 635.6138301516.

The spelling of 256791128 in words is "two hundred fifty-six million, seven hundred ninety-one thousand, one hundred twenty-eight".