686987789686 has 16 divisors (see below), whose sum is σ = 1124198792640. Its totient is φ = 312256911880.

The previous prime is 686987789641. The next prime is 686987789749.

686987789686 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 686987789597 and 686987789606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192765 + ... + 1187911.

It is an arithmetic number, because the mean of its divisors is an integer number (70262424540).

Almost surely, 2^686987789686 is an apocalyptic number.

686987789686 is a deficient number, since it is larger than the sum of its proper divisors (437211002954).

686987789686 is a wasteful number, since it uses less digits than its factorization.

686987789686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026539.

The product of its digits is 21069103104, while the sum is 88.

The spelling of 686987789686 in words is "six hundred eighty-six billion, nine hundred eighty-seven million, seven hundred eighty-nine thousand, six hundred eighty-six".