285666 has 16 divisors (see below), whose sum is σ = 584064. Its totient is φ = 93104.

The previous prime is 285661. The next prime is 285667. The reversal of 285666 is 666582.

It is not an unprimeable number, because it can be changed into a prime (285661) 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, 225 + ... + 788.

It is an arithmetic number, because the mean of its divisors is an integer number (36504).

2²⁸⁵⁶⁶⁶ is an apocalyptic number.

285666 is an abundant number, since it is smaller than the sum of its proper divisors (298398).

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

285666 is a wasteful number, since it uses less digits than its factorization.

285666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065.

The product of its digits is 17280, while the sum is 33.

The square root of 285666 is about 534.4773147665. The cubic root of 285666 is about 65.8596650883.

It can be divided in two parts, 28566 and 6, that multiplied together give a square (171396 = 414²).

The spelling of 285666 in words is "two hundred eighty-five thousand, six hundred sixty-six".