686288 has 20 divisors (see below), whose sum is σ = 1354080. Its totient is φ = 336864.

The previous prime is 686269. The next prime is 686293. The reversal of 686288 is 882686.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581 + ... + 1307.

It is an arithmetic number, because the mean of its divisors is an integer number (67704).

2⁶⁸⁶²⁸⁸ is an apocalyptic number.

It is an amenable number.

686288 is a deficient number, since it is larger than the sum of its proper divisors (667792).

686288 is a wasteful number, since it uses less digits than its factorization.

686288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 788 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 686288 is about 828.4250116939. The cubic root of 686288 is about 88.2068138496.

The spelling of 686288 in words is "six hundred eighty-six thousand, two hundred eighty-eight".