285560 has 48 divisors (see below), whose sum is σ = 718200. Its totient is φ = 102080.

The previous prime is 285559. The next prime is 285569. The reversal of 285560 is 65582.

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 11 ways as a sum of consecutive naturals, for example, 4811 + ... + 4869.

2²⁸⁵⁵⁶⁰ is an apocalyptic number.

285560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (359100).

285560 is an abundant number, since it is smaller than the sum of its proper divisors (432640).

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

285560 is a wasteful number, since it uses less digits than its factorization.

285560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 285560 is about 534.3781432656. The cubic root of 285560 is about 65.8515180586.

The spelling of 285560 in words is "two hundred eighty-five thousand, five hundred sixty".