686321716 has 12 divisors (see below), whose sum is σ = 1210521088. Its totient is φ = 340458552.

The previous prime is 686321693. The next prime is 686321719. The reversal of 686321716 is 617123686.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686321719) 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, 675006 + ... + 676021.

Almost surely, 2^686321716 is an apocalyptic number.

It is an amenable number.

686321716 is a deficient number, since it is larger than the sum of its proper divisors (524199372).

686321716 is a wasteful number, since it uses less digits than its factorization.

686321716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351158 (or 1351156 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 686321716 is about 26197.7425745044. The cubic root of 686321716 is about 882.0825830260.

The spelling of 686321716 in words is "six hundred eighty-six million, three hundred twenty-one thousand, seven hundred sixteen".