255808 has 28 divisors (see below), whose sum is σ = 581152. Its totient is φ = 109440.

The previous prime is 255803. The next prime is 255839. The reversal of 255808 is 808552.

255808 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163 + ... + 733.

2²⁵⁵⁸⁰⁸ is an apocalyptic number.

255808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290576).

255808 is an abundant number, since it is smaller than the sum of its proper divisors (325344).

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

255808 is an equidigital number, since it uses as much as digits as its factorization.

255808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 255808 is about 505.7746533784. The cubic root of 255808 is about 63.4801640981.

The spelling of 255808 in words is "two hundred fifty-five thousand, eight hundred eight".