686729685 has 16 divisors (see below), whose sum is σ = 1099478016. Its totient is φ = 366019008.

The previous prime is 686729683. The next prime is 686729713. The reversal of 686729685 is 586927686.

It is not a de Polignac number, because 686729685 - 2¹ = 686729683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686729683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10572 + ... + 38538.

It is an arithmetic number, because the mean of its divisors is an integer number (68717376).

Almost surely, 2^686729685 is an apocalyptic number.

It is an amenable number.

686729685 is a deficient number, since it is larger than the sum of its proper divisors (412748331).

686729685 is a wasteful number, since it uses less digits than its factorization.

686729685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29612.

The product of its digits is 8709120, while the sum is 57.

The square root of 686729685 is about 26205.5277565631. The cubic root of 686729685 is about 882.2573266680.

The spelling of 686729685 in words is "six hundred eighty-six million, seven hundred twenty-nine thousand, six hundred eighty-five".