686405028668 has 12 divisors (see below), whose sum is σ = 1201224649632. Its totient is φ = 343197985920.

The previous prime is 686405028667. The next prime is 686405028679. The reversal of 686405028668 is 866820504686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686405028667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778805 + ... + 1406892.

It is an arithmetic number, because the mean of its divisors is an integer number (100102054136).

Almost surely, 2^686405028668 is an apocalyptic number.

It is an amenable number.

686405028668 is a deficient number, since it is larger than the sum of its proper divisors (514819620964).

686405028668 is a wasteful number, since it uses less digits than its factorization.

686405028668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264212 (or 2264210 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 59.

The spelling of 686405028668 in words is "six hundred eighty-six billion, four hundred five million, twenty-eight thousand, six hundred sixty-eight".