285800 has 24 divisors (see below), whose sum is σ = 664950. Its totient is φ = 114240.

The previous prime is 285781. The next prime is 285823. The reversal of 285800 is 8582.

It can be written as a sum of positive squares in 3 ways, for example, as 139876 + 145924 = 374^2 + 382^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

285800 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 515 + ... + 914.

2²⁸⁵⁸⁰⁰ is an apocalyptic number.

285800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285800 is an abundant number, since it is smaller than the sum of its proper divisors (379150).

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

285800 is a wasteful number, since it uses less digits than its factorization.

285800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445 (or 1436 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 285800 is about 534.6026561849. The cubic root of 285800 is about 65.8699612799.

The spelling of 285800 in words is "two hundred eighty-five thousand, eight hundred".