256381276 has 12 divisors (see below), whose sum is σ = 468174672. Its totient is φ = 122617088.

The previous prime is 256381271. The next prime is 256381283. The reversal of 256381276 is 672183652.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256381271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1393285 + ... + 1393468.

It is an arithmetic number, because the mean of its divisors is an integer number (39014556).

Almost surely, 2^256381276 is an apocalyptic number.

It is an amenable number.

256381276 is a deficient number, since it is larger than the sum of its proper divisors (211793396).

256381276 is a wasteful number, since it uses less digits than its factorization.

256381276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2786780 (or 2786778 counting only the distinct ones).

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

The square root of 256381276 is about 16011.9104419179. The cubic root of 256381276 is about 635.2754925058.

The spelling of 256381276 in words is "two hundred fifty-six million, three hundred eighty-one thousand, two hundred seventy-six".