285980 has 24 divisors (see below), whose sum is σ = 611520. Its totient is φ = 112320.

The previous prime is 285979. The next prime is 285983. The reversal of 285980 is 89582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1490 + ... + 1670.

It is an arithmetic number, because the mean of its divisors is an integer number (25480).

2²⁸⁵⁹⁸⁰ is an apocalyptic number.

285980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285980 is an abundant number, since it is smaller than the sum of its proper divisors (325540).

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

285980 is a wasteful number, since it uses less digits than its factorization.

285980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 285980 is about 534.7709790181. The cubic root of 285980 is about 65.8837869211.

The spelling of 285980 in words is "two hundred eighty-five thousand, nine hundred eighty".