686668814 has 8 divisors (see below), whose sum is σ = 1109234280. Its totient is φ = 316924056.

The previous prime is 686668813. The next prime is 686668819. The reversal of 686668814 is 418866686.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686668813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13205144 + ... + 13205195.

It is an arithmetic number, because the mean of its divisors is an integer number (138654285).

Almost surely, 2^686668814 is an apocalyptic number.

686668814 is a deficient number, since it is larger than the sum of its proper divisors (422565466).

686668814 is a wasteful number, since it uses less digits than its factorization.

686668814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26410354.

The product of its digits is 2654208, while the sum is 53.

The square root of 686668814 is about 26204.3663155589. The cubic root of 686668814 is about 882.2312584427.

The spelling of 686668814 in words is "six hundred eighty-six million, six hundred sixty-eight thousand, eight hundred fourteen".