256849278 has 48 divisors (see below), whose sum is σ = 599249664. Its totient is φ = 73179120.

The previous prime is 256849267. The next prime is 256849279. The reversal of 256849278 is 872948652.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 256849278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256849279) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 125701 + ... + 127727.

It is an arithmetic number, because the mean of its divisors is an integer number (12484368).

Almost surely, 2^256849278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256849278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299624832).

256849278 is an abundant number, since it is smaller than the sum of its proper divisors (342400386).

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

256849278 is a wasteful number, since it uses less digits than its factorization.

256849278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477 (or 2470 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The square root of 256849278 is about 16026.5179624271. The cubic root of 256849278 is about 635.6618044916.

The spelling of 256849278 in words is "two hundred fifty-six million, eight hundred forty-nine thousand, two hundred seventy-eight".