256843660 has 12 divisors (see below), whose sum is σ = 539371728. Its totient is φ = 102737456.

The previous prime is 256843651. The next prime is 256843661. The reversal of 256843660 is 66348652.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (256843661) by changing a digit.

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, 6421072 + ... + 6421111.

It is an arithmetic number, because the mean of its divisors is an integer number (44947644).

Almost surely, 2^256843660 is an apocalyptic number.

256843660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256843660 is an abundant number, since it is smaller than the sum of its proper divisors (282528068).

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

256843660 is a wasteful number, since it uses less digits than its factorization.

256843660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12842192 (or 12842190 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 256843660 is about 16026.3426894598. The cubic root of 256843660 is about 635.6571699006.

The spelling of 256843660 in words is "two hundred fifty-six million, eight hundred forty-three thousand, six hundred sixty".