686608 has 20 divisors (see below), whose sum is σ = 1433068. Its totient is φ = 316800.

The previous prime is 686593. The next prime is 686611. The reversal of 686608 is 806686.

It is a happy number.

686608 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 2 ways, for example, as 121104 + 565504 = 348^2 + 752^2 .

It is a congruent number.

It is an unprimeable number.

686608 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1443 + ... + 1858.

2⁶⁸⁶⁶⁰⁸ is an apocalyptic number.

It is an amenable number.

686608 is an abundant number, since it is smaller than the sum of its proper divisors (746460).

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

686608 is a wasteful number, since it uses less digits than its factorization.

686608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322 (or 3316 counting only the distinct ones).

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

The square root of 686608 is about 828.6181267629. The cubic root of 686608 is about 88.2205213089.

The spelling of 686608 in words is "six hundred eighty-six thousand, six hundred eight".