256822460 has 24 divisors (see below), whose sum is σ = 540446256. Its totient is φ = 102515840.

The previous prime is 256822441. The next prime is 256822493. The reversal of 256822460 is 64228652.

It is a self number, because there is not a number n which added to its sum of digits gives 256822460.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3257 + ... + 22896.

It is an arithmetic number, because the mean of its divisors is an integer number (22518594).

Almost surely, 2^256822460 is an apocalyptic number.

256822460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256822460 is an abundant number, since it is smaller than the sum of its proper divisors (283623796).

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

256822460 is a wasteful number, since it uses less digits than its factorization.

256822460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26653 (or 26651 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 256822460 is about 16025.6812647700. The cubic root of 256822460 is about 635.6396802692.

The spelling of 256822460 in words is "two hundred fifty-six million, eight hundred twenty-two thousand, four hundred sixty".