686068 has 6 divisors (see below), whose sum is σ = 1200626. Its totient is φ = 343032.

The previous prime is 686057. The next prime is 686087. The reversal of 686068 is 860686.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 685584 + 484 = 828^2 + 22^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85755 + ... + 85762.

2⁶⁸⁶⁰⁶⁸ is an apocalyptic number.

It is an amenable number.

686068 is a deficient number, since it is larger than the sum of its proper divisors (514558).

686068 is a wasteful number, since it uses less digits than its factorization.

686068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171521 (or 171519 counting only the distinct ones).

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

The square root of 686068 is about 828.2922189662. The cubic root of 686068 is about 88.1973874995.

The spelling of 686068 in words is "six hundred eighty-six thousand, sixty-eight".