285890 has 32 divisors (see below), whose sum is σ = 590976. Its totient is φ = 98560.

The previous prime is 285871. The next prime is 285937. The reversal of 285890 is 98582.

285890 is nontrivially palindromic in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2474 + ... + 2586.

It is an arithmetic number, because the mean of its divisors is an integer number (18468).

2²⁸⁵⁸⁹⁰ is an apocalyptic number.

285890 is an abundant number, since it is smaller than the sum of its proper divisors (305086).

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

285890 is a wasteful number, since it uses less digits than its factorization.

285890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154.

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

The square root of 285890 is about 534.6868242252. The cubic root of 285890 is about 65.8768748259.

The spelling of 285890 in words is "two hundred eighty-five thousand, eight hundred ninety".