255636 has 36 divisors (see below), whose sum is σ = 672672. Its totient is φ = 84888.

The previous prime is 255617. The next prime is 255637. The reversal of 255636 is 636552.

255636 is a `hidden beast` number, since 25 + 5 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255637) by changing a digit.

255636 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 841 + ... + 1103.

2²⁵⁵⁶³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336336).

255636 is an abundant number, since it is smaller than the sum of its proper divisors (417036).

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

255636 is a wasteful number, since it uses less digits than its factorization.

255636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 268 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 255636 is about 505.6045885868. The cubic root of 255636 is about 63.4659333256.

The spelling of 255636 in words is "two hundred fifty-five thousand, six hundred thirty-six".