256291312 has 10 divisors (see below), whose sum is σ = 496564448. Its totient is φ = 128145648.

The previous prime is 256291307. The next prime is 256291319. The reversal of 256291312 is 213192652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256291319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8009088 + ... + 8009119.

Almost surely, 2^256291312 is an apocalyptic number.

It is an amenable number.

256291312 is a deficient number, since it is larger than the sum of its proper divisors (240273136).

256291312 is a wasteful number, since it uses less digits than its factorization.

256291312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16018215 (or 16018209 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 256291312 is about 16009.1009116690. The cubic root of 256291312 is about 635.2011779128.

The spelling of 256291312 in words is "two hundred fifty-six million, two hundred ninety-one thousand, three hundred twelve".