686568 has 16 divisors (see below), whose sum is σ = 1716480. Its totient is φ = 228848.

The previous prime is 686563. The next prime is 686593. The reversal of 686568 is 865686.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (686563) by changing a digit.

686568 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 3 ways as a sum of consecutive naturals, for example, 14280 + ... + 14327.

It is an arithmetic number, because the mean of its divisors is an integer number (107280).

2⁶⁸⁶⁵⁶⁸ is an apocalyptic number.

It is an amenable number.

686568 is an abundant number, since it is smaller than the sum of its proper divisors (1029912).

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

686568 is a wasteful number, since it uses less digits than its factorization.

686568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28616 (or 28612 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 686568 is about 828.5939898406. The cubic root of 686568 is about 88.2188081095.

The spelling of 686568 in words is "six hundred eighty-six thousand, five hundred sixty-eight".