255645 has 48 divisors (see below), whose sum is σ = 524160. Its totient is φ = 114048.

The previous prime is 255641. The next prime is 255649. The reversal of 255645 is 546552.

It is an interprime number because it is at equal distance from previous prime (255641) and next prime (255649).

It is not a de Polignac number, because 255645 - 2² = 255641 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

255645 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11104 + ... + 11126.

It is an arithmetic number, because the mean of its divisors is an integer number (10920).

2²⁵⁵⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

255645 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

255645 is a wasteful number, since it uses less digits than its factorization.

255645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 63 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 255645 is about 505.6134887441. The cubic root of 255645 is about 63.4666781173.

It can be divided in two parts, 2556 and 45, that added together give a square (2601 = 51²).

The spelling of 255645 in words is "two hundred fifty-five thousand, six hundred forty-five".