280085 has 16 divisors (see below), whose sum is σ = 376320. Its totient is φ = 198720.

The previous prime is 280069. The next prime is 280097. The reversal of 280085 is 580082.

It is not a de Polignac number, because 280085 - 2⁴ = 280069 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 280085.

It is a congruent number.

It is an unprimeable 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 15 ways as a sum of consecutive naturals, for example, 1946 + ... + 2084.

It is an arithmetic number, because the mean of its divisors is an integer number (23520).

2²⁸⁰⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

280085 is a deficient number, since it is larger than the sum of its proper divisors (96235).

280085 is a wasteful number, since it uses less digits than its factorization.

280085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188.

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

The square root of 280085 is about 529.2305735688. The cubic root of 280085 is about 65.4279455492.

The spelling of 280085 in words is "two hundred eighty thousand, eighty-five".