686040685 has 16 divisors (see below), whose sum is σ = 899062272. Its totient is φ = 498398400.

The previous prime is 686040679. The next prime is 686040689. The reversal of 686040685 is 586040686.

It is not a de Polignac number, because 686040685 - 2¹¹ = 686038637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686040689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48580 + ... + 61090.

It is an arithmetic number, because the mean of its divisors is an integer number (56191392).

Almost surely, 2^686040685 is an apocalyptic number.

It is an amenable number.

686040685 is a deficient number, since it is larger than the sum of its proper divisors (213021587).

686040685 is a wasteful number, since it uses less digits than its factorization.

686040685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13524.

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 686040685 is about 26192.3783761613. The cubic root of 686040685 is about 881.9621699178.

Subtracting from 686040685 its reverse (586040686), we obtain a palindrome (99999999).

The spelling of 686040685 in words is "six hundred eighty-six million, forty thousand, six hundred eighty-five".