686286 has 32 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 224280.

The previous prime is 686269. The next prime is 686293. The reversal of 686286 is 682686.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 686286.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 3745 + ... + 3923.

It is an arithmetic number, because the mean of its divisors is an integer number (48600).

2⁶⁸⁶²⁸⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777600).

686286 is an abundant number, since it is smaller than the sum of its proper divisors (868914).

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

686286 is a wasteful number, since it uses less digits than its factorization.

686286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 255 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 686286 is about 828.4238045831. The cubic root of 686286 is about 88.2067281646.

Subtracting from 686286 its reverse (682686), we obtain a square (3600 = 60²).

The spelling of 686286 in words is "six hundred eighty-six thousand, two hundred eighty-six".