686826868 has 24 divisors (see below), whose sum is σ = 1479320192. Its totient is φ = 271711584.

The previous prime is 686826859. The next prime is 686826919. The reversal of 686826868 is 868628686.

It is a happy number.

It is a super-2 number, since 2×686826868² = 943462293213378848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 943080 + ... + 943807.

Almost surely, 2^686826868 is an apocalyptic number.

It is an amenable number.

686826868 is an abundant number, since it is smaller than the sum of its proper divisors (792493324).

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

686826868 is a wasteful number, since it uses less digits than its factorization.

686826868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886911 (or 1886909 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 58.

The square root of 686826868 is about 26207.3819371566. The cubic root of 686826868 is about 882.2989424457.

The spelling of 686826868 in words is "six hundred eighty-six million, eight hundred twenty-six thousand, eight hundred sixty-eight".