256867860 has 48 divisors (see below), whose sum is σ = 742436352. Its totient is φ = 66288000.

The previous prime is 256867837. The next prime is 256867867. The reversal of 256867860 is 68768652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256867867) 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 15 ways as a sum of consecutive naturals, for example, 67191 + ... + 70910.

It is an arithmetic number, because the mean of its divisors is an integer number (15467424).

Almost surely, 2^256867860 is an apocalyptic number.

256867860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256867860 is an abundant number, since it is smaller than the sum of its proper divisors (485568492).

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

256867860 is a wasteful number, since it uses less digits than its factorization.

256867860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138144 (or 138142 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The square root of 256867860 is about 16027.0976786192. The cubic root of 256867860 is about 635.6771333035.

The spelling of 256867860 in words is "two hundred fifty-six million, eight hundred sixty-seven thousand, eight hundred sixty".