285564 has 24 divisors (see below), whose sum is σ = 680400. Its totient is φ = 93184.

The previous prime is 285559. The next prime is 285569. The reversal of 285564 is 465582.

It is an interprime number because it is at equal distance from previous prime (285559) and next prime (285569).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 412 + ... + 860.

It is an arithmetic number, because the mean of its divisors is an integer number (28350).

2²⁸⁵⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

285564 is an abundant number, since it is smaller than the sum of its proper divisors (394836).

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

285564 is a wasteful number, since it uses less digits than its factorization.

285564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509 (or 507 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 285564 is about 534.3818859205. The cubic root of 285564 is about 65.8518255303.

The spelling of 285564 in words is "two hundred eighty-five thousand, five hundred sixty-four".