686804008402 has 8 divisors (see below), whose sum is σ = 1030218997500. Its totient is φ = 343397675904.

The previous prime is 686804008381. The next prime is 686804008411. The reversal of 686804008402 is 204800408686.

It can be written as a sum of positive squares in 2 ways, for example, as 626011681681 + 60792326721 = 791209^2 + 246561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1962027 + ... + 2285422.

Almost surely, 2^686804008402 is an apocalyptic number.

686804008402 is a deficient number, since it is larger than the sum of its proper divisors (343414989098).

686804008402 is a wasteful number, since it uses less digits than its factorization.

686804008402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4328300.

The product of its (nonzero) digits is 589824, while the sum is 46.

The spelling of 686804008402 in words is "six hundred eighty-six billion, eight hundred four million, eight thousand, four hundred two".