686860 has 24 divisors (see below), whose sum is σ = 1468656. Its totient is φ = 269760.

The previous prime is 686843. The next prime is 686863. The reversal of 686860 is 68686.

It is a happy number.

686860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686863) 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, 939 + ... + 1501.

It is an arithmetic number, because the mean of its divisors is an integer number (61194).

2⁶⁸⁶⁸⁶⁰ is an apocalyptic number.

It is an amenable number.

686860 is an abundant number, since it is smaller than the sum of its proper divisors (781796).

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

686860 is a wasteful number, since it uses less digits than its factorization.

686860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 686860 is about 828.7701732085. The cubic root of 686860 is about 88.2313129358.

The spelling of 686860 in words is "six hundred eighty-six thousand, eight hundred sixty".