285204 has 12 divisors (see below), whose sum is σ = 665504. Its totient is φ = 95064.

The previous prime is 285199. The next prime is 285221. The reversal of 285204 is 402582.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

285204 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11872 + ... + 11895.

2²⁸⁵²⁰⁴ is an apocalyptic number.

It is an amenable number.

285204 is an abundant number, since it is smaller than the sum of its proper divisors (380300).

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

285204 is a wasteful number, since it uses less digits than its factorization.

285204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23774 (or 23772 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 285204 is about 534.0449419290. The cubic root of 285204 is about 65.8241415713.

Adding to 285204 its reverse (402582), we get a palindrome (687786).

The spelling of 285204 in words is "two hundred eighty-five thousand, two hundred four".