285856 has 12 divisors (see below), whose sum is σ = 562842. Its totient is φ = 142912.

The previous prime is 285841. The next prime is 285871. The reversal of 285856 is 658582.

It is an interprime number because it is at equal distance from previous prime (285841) and next prime (285871).

It can be written as a sum of positive squares in only one way, i.e., 266256 + 19600 = 516^2 + 140^2 .

It is an unprimeable number.

285856 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 as a sum of consecutive naturals, namely, 4435 + ... + 4498.

2²⁸⁵⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

285856 is a deficient number, since it is larger than the sum of its proper divisors (276986).

285856 is an equidigital number, since it uses as much as digits as its factorization.

285856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8943 (or 8935 counting only the distinct ones).

The product of its digits is 19200, while the sum is 34.

The square root of 285856 is about 534.6550289673. The cubic root of 285856 is about 65.8742632124.

It can be divided in two parts, 2 and 85856, that added together give a palindrome (85858).

The spelling of 285856 in words is "two hundred eighty-five thousand, eight hundred fifty-six".