285550 has 12 divisors (see below), whose sum is σ = 531216. Its totient is φ = 114200.

The previous prime is 285539. The next prime is 285553. The reversal of 285550 is 55582.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285553) by changing a digit.

285550 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 2806 + ... + 2905.

It is an arithmetic number, because the mean of its divisors is an integer number (44268).

2²⁸⁵⁵⁵⁰ is an apocalyptic number.

285550 is a deficient number, since it is larger than the sum of its proper divisors (245666).

285550 is a wasteful number, since it uses less digits than its factorization.

285550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5723 (or 5718 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 285550 is about 534.3687865136. The cubic root of 285550 is about 65.8507493668.

The spelling of 285550 in words is "two hundred eighty-five thousand, five hundred fifty".