285565 has 16 divisors (see below), whose sum is σ = 403200. Its totient is φ = 190080.

The previous prime is 285559. The next prime is 285569. The reversal of 285565 is 565582.

It is not a de Polignac number, because 285565 - 2³ = 285557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1336 + ... + 1534.

It is an arithmetic number, because the mean of its divisors is an integer number (25200).

2²⁸⁵⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

285565 is a deficient number, since it is larger than the sum of its proper divisors (117635).

285565 is a wasteful number, since it uses less digits than its factorization.

285565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252.

The product of its digits is 12000, while the sum is 31.

The square root of 285565 is about 534.3828215802. The cubic root of 285565 is about 65.8519023978.

It can be divided in two parts, 28556 and 5, that added together give a 4-th power (28561 = 13⁴).

The spelling of 285565 in words is "two hundred eighty-five thousand, five hundred sixty-five".