255606 has 32 divisors (see below), whose sum is σ = 574560. Its totient is φ = 75264.

The previous prime is 255589. The next prime is 255613. The reversal of 255606 is 606552.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2206 + ... + 2318.

It is an arithmetic number, because the mean of its divisors is an integer number (17955).

2²⁵⁵⁶⁰⁶ is an apocalyptic number.

255606 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 255606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287280).

255606 is an abundant number, since it is smaller than the sum of its proper divisors (318954).

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

255606 is a wasteful number, since it uses less digits than its factorization.

255606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 255606 is about 505.5749202640. The cubic root of 255606 is about 63.4634505605.

It can be divided in two parts, 255 and 606, that added together give a triangular number (861 = T₄₁).

The spelling of 255606 in words is "two hundred fifty-five thousand, six hundred six".