256690338 has 16 divisors (see below), whose sum is σ = 520414176. Its totient is φ = 84391200.

The previous prime is 256690337. The next prime is 256690351. The reversal of 256690338 is 833096652.

It is a self number, because there is not a number n which added to its sum of digits gives 256690338.

It is not an unprimeable number, because it can be changed into a prime (256690337) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 292588 + ... + 293463.

It is an arithmetic number, because the mean of its divisors is an integer number (32525886).

Almost surely, 2^256690338 is an apocalyptic number.

256690338 is an abundant number, since it is smaller than the sum of its proper divisors (263723838).

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

256690338 is a wasteful number, since it uses less digits than its factorization.

256690338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586129.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 256690338 is about 16021.5585384194. The cubic root of 256690338 is about 635.5306602204.

The spelling of 256690338 in words is "two hundred fifty-six million, six hundred ninety thousand, three hundred thirty-eight".