256899258 has 72 divisors (see below), whose sum is σ = 706380480. Its totient is φ = 66724560.

The previous prime is 256899241. The next prime is 256899271. The reversal of 256899258 is 852998652.

It is a super-3 number, since 3×256899258³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3538 + ... + 22941.

It is an arithmetic number, because the mean of its divisors is an integer number (9810840).

Almost surely, 2^256899258 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256899258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (353190240).

256899258 is an abundant number, since it is smaller than the sum of its proper divisors (449481222).

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

256899258 is a wasteful number, since it uses less digits than its factorization.

256899258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26512 (or 26502 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The square root of 256899258 is about 16028.0771772537. The cubic root of 256899258 is about 635.7030327127.

The spelling of 256899258 in words is "two hundred fifty-six million, eight hundred ninety-nine thousand, two hundred fifty-eight".