686868686 has 16 divisors (see below), whose sum is σ = 1179761760. Its totient is φ = 293804160.

The previous prime is 686868673. The next prime is 686868701.

686868686 is nontrivially palindromic in base 10.

686868686 is an undulating number in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39791 + ... + 54378.

It is an arithmetic number, because the mean of its divisors is an integer number (73735110).

Almost surely, 2^686868686 is an apocalyptic number.

686868686 is a deficient number, since it is larger than the sum of its proper divisors (492893074).

686868686 is a wasteful number, since it uses less digits than its factorization.

686868686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94699.

The product of its digits is 31850496, while the sum is 62.

The square root of 686868686 is about 26208.1797536571. The cubic root of 686868686 is about 882.3168485732.

The spelling of 686868686 in words is "six hundred eighty-six million, eight hundred sixty-eight thousand, six hundred eighty-six".