256959808 has 28 divisors (see below), whose sum is σ = 582749152. Its totient is φ = 110125440.

The previous prime is 256959767. The next prime is 256959823. The reversal of 256959808 is 808959652.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286338 + ... + 287233.

Almost surely, 2^256959808 is an apocalyptic number.

256959808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

256959808 is an abundant number, since it is smaller than the sum of its proper divisors (325789344).

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

256959808 is an equidigital number, since it uses as much as digits as its factorization.

256959808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573590 (or 573580 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 52.

The square root of 256959808 is about 16029.9659388284. The cubic root of 256959808 is about 635.7529729049.

The spelling of 256959808 in words is "two hundred fifty-six million, nine hundred fifty-nine thousand, eight hundred eight".