285858 has 12 divisors (see below), whose sum is σ = 619398. Its totient is φ = 95280.

The previous prime is 285841. The next prime is 285871. The reversal of 285858 is 858582.

It can be written as a sum of positive squares in only one way, i.e., 178929 + 106929 = 423^2 + 327^2 .

It is a Curzon number.

It is an unprimeable number.

285858 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7923 + ... + 7958.

2²⁸⁵⁸⁵⁸ is an apocalyptic number.

285858 is an abundant number, since it is smaller than the sum of its proper divisors (333540).

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

285858 is a wasteful number, since it uses less digits than its factorization.

285858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15889 (or 15886 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 285858 is about 534.6568993289. The cubic root of 285858 is about 65.8744168424.

It can be divided in two parts, 2858 and 58, that added together give a square (2916 = 54²).

The spelling of 285858 in words is "two hundred eighty-five thousand, eight hundred fifty-eight".