286666 has 4 divisors (see below), whose sum is σ = 430002. Its totient is φ = 143332.

The previous prime is 286651. The next prime is 286673. The reversal of 286666 is 666682.

286666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666682 = 2 ⋅333341.

It can be written as a sum of positive squares in only one way, i.e., 286225 + 441 = 535^2 + 21^2 .

286666 is a modest number, since divided by 666 gives 286 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71665 + ... + 71668.

2²⁸⁶⁶⁶⁶ is an apocalyptic number.

286666 is a deficient number, since it is larger than the sum of its proper divisors (143336).

286666 is a wasteful number, since it uses less digits than its factorization.

286666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143335.

The product of its digits is 20736, while the sum is 34.

The square root of 286666 is about 535.4119909005. The cubic root of 286666 is about 65.9364248531.

It can be divided in two parts, 2 and 86666, that added together give a palindrome (86668).

The spelling of 286666 in words is "two hundred eighty-six thousand, six hundred sixty-six".