686776329 has 6 divisors (see below), whose sum is σ = 992010266. Its totient is φ = 457850880.

The previous prime is 686776327. The next prime is 686776339. The reversal of 686776329 is 923677686.

It can be written as a sum of positive squares in only one way, i.e., 534303225 + 152473104 = 23115^2 + 12348^2 .

It is not a de Polignac number, because 686776329 - 2¹ = 686776327 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (686776327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38154232 + ... + 38154249.

Almost surely, 2^686776329 is an apocalyptic number.

It is an amenable number.

686776329 is a deficient number, since it is larger than the sum of its proper divisors (305233937).

686776329 is a wasteful number, since it uses less digits than its factorization.

686776329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76308487 (or 76308484 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 686776329 is about 26206.4177063558. The cubic root of 686776329 is about 882.2773010869.

The spelling of 686776329 in words is "six hundred eighty-six million, seven hundred seventy-six thousand, three hundred twenty-nine".