256800290 has 16 divisors (see below), whose sum is σ = 482338368. Its totient is φ = 98253936.

The previous prime is 256800259. The next prime is 256800319. The reversal of 256800290 is 92008652.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 558032 + ... + 558491.

It is an arithmetic number, because the mean of its divisors is an integer number (30146148).

Almost surely, 2^256800290 is an apocalyptic number.

256800290 is a deficient number, since it is larger than the sum of its proper divisors (225538078).

256800290 is a wasteful number, since it uses less digits than its factorization.

256800290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116553.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 256800290 is about 16024.9895475785. The cubic root of 256800290 is about 635.6213893752.

The spelling of 256800290 in words is "two hundred fifty-six million, eight hundred thousand, two hundred ninety".