256840794 has 96 divisors (see below), whose sum is σ = 698495616. Its totient is φ = 69050880.

The previous prime is 256840781. The next prime is 256840799. The reversal of 256840794 is 497048652.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (256840799) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55614 + ... + 60054.

It is an arithmetic number, because the mean of its divisors is an integer number (7275996).

Almost surely, 2^256840794 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256840794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349247808).

256840794 is an abundant number, since it is smaller than the sum of its proper divisors (441654822).

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

256840794 is a wasteful number, since it uses less digits than its factorization.

256840794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4482 (or 4470 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 256840794 is about 16026.2532739253. The cubic root of 256840794 is about 635.6548055567.

The spelling of 256840794 in words is "two hundred fifty-six million, eight hundred forty thousand, seven hundred ninety-four".