686828686 has 16 divisors (see below), whose sum is σ = 1044987840. Its totient is φ = 338513760.

The previous prime is 686828657. The next prime is 686828693.

It is a happy number.

686828686 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 686828686.

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 in 7 ways as a sum of consecutive naturals, for example, 103756 + ... + 110176.

It is an arithmetic number, because the mean of its divisors is an integer number (65311740).

Almost surely, 2^686828686 is an apocalyptic number.

686828686 is a deficient number, since it is larger than the sum of its proper divisors (358159154).

686828686 is a wasteful number, since it uses less digits than its factorization.

686828686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7179.

The product of its digits is 10616832, while the sum is 58.

The square root of 686828686 is about 26207.4166220175. The cubic root of 686828686 is about 882.2997209136.

The spelling of 686828686 in words is "six hundred eighty-six million, eight hundred twenty-eight thousand, six hundred eighty-six".