686606 has 4 divisors (see below), whose sum is σ = 1029912. Its totient is φ = 343302.

The previous prime is 686593. The next prime is 686611. The reversal of 686606 is 606686.

It is a happy number.

686606 is digitally balanced in base 2, 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.

It is a congruent number.

It is an unprimeable number.

686606 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 as a sum of consecutive naturals, namely, 171650 + ... + 171653.

It is an arithmetic number, because the mean of its divisors is an integer number (257478).

2⁶⁸⁶⁶⁰⁶ is an apocalyptic number.

686606 is a deficient number, since it is larger than the sum of its proper divisors (343306).

686606 is a wasteful number, since it uses less digits than its factorization.

686606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343305.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 686606 is about 828.6169199335. The cubic root of 686606 is about 88.2204356505.

The spelling of 686606 in words is "six hundred eighty-six thousand, six hundred six".