285500 has 24 divisors (see below), whose sum is σ = 624624. Its totient is φ = 114000.

The previous prime is 285497. The next prime is 285517. The reversal of 285500 is 5582.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215 + ... + 785.

It is an arithmetic number, because the mean of its divisors is an integer number (26026).

2²⁸⁵⁵⁰⁰ is an apocalyptic number.

285500 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 285500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312312).

285500 is an abundant number, since it is smaller than the sum of its proper divisors (339124).

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

285500 is a wasteful number, since it uses less digits than its factorization.

285500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590 (or 578 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 285500 is about 534.3220002957. The cubic root of 285500 is about 65.8469056388.

The spelling of 285500 in words is "two hundred eighty-five thousand, five hundred".