256801898 has 8 divisors (see below), whose sum is σ = 407861892. Its totient is φ = 120847936.

The previous prime is 256801859. The next prime is 256801913. The reversal of 256801898 is 898108652.

It can be written as a sum of positive squares in 2 ways, for example, as 245016409 + 11785489 = 15653^2 + 3433^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3776465 + ... + 3776532.

Almost surely, 2^256801898 is an apocalyptic number.

256801898 is a deficient number, since it is larger than the sum of its proper divisors (151059994).

256801898 is a wasteful number, since it uses less digits than its factorization.

256801898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7553016.

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 256801898 is about 16025.0397191395. The cubic root of 256801898 is about 635.6227160573.

The spelling of 256801898 in words is "two hundred fifty-six million, eight hundred one thousand, eight hundred ninety-eight".