686682 has 12 divisors (see below), whose sum is σ = 1487850. Its totient is φ = 228888.

The previous prime is 686671. The next prime is 686687. The reversal of 686682 is 286686.

It can be written as a sum of positive squares in only one way, i.e., 447561 + 239121 = 669^2 + 489^2 .

It is not an unprimeable number, because it can be changed into a prime (686687) by changing a digit.

686682 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 5 ways as a sum of consecutive naturals, for example, 19057 + ... + 19092.

2⁶⁸⁶⁶⁸² is an apocalyptic number.

686682 is an abundant number, since it is smaller than the sum of its proper divisors (801168).

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

686682 is a wasteful number, since it uses less digits than its factorization.

686682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38157 (or 38154 counting only the distinct ones).

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

The square root of 686682 is about 828.6627782156. The cubic root of 686682 is about 88.2236905525.

The spelling of 686682 in words is "six hundred eighty-six thousand, six hundred eighty-two".