686686686 has 32 divisors (see below), whose sum is σ = 1601606400. Its totient is φ = 196195608.

The previous prime is 686686579. The next prime is 686686687.

686686686 is nontrivially palindromic in base 10.

686686686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

686686686 is a modest number, since divided by 686686 gives 686 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686686687) 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, 164776 + ... + 168891.

It is an arithmetic number, because the mean of its divisors is an integer number (50050200).

Almost surely, 2^686686686 is an apocalyptic number.

686686686 is an abundant number, since it is smaller than the sum of its proper divisors (914919714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686686686 is a wasteful number, since it uses less digits than its factorization.

686686686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333693 (or 333679 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 60.

The square root of 686686686 is about 26204.7073252116. The cubic root of 686686686 is about 882.2389123509.

The spelling of 686686686 in words is "six hundred eighty-six million, six hundred eighty-six thousand, six hundred eighty-six".