686888888686 has 384 divisors, whose sum is σ = 1475981844480. Its totient is φ = 232569792000.

The previous prime is 686888888671. The next prime is 686888888737.

It is a happy number.

686888888686 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 686888888597 and 686888888606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6668824111 + ... + 6668824213.

It is an arithmetic number, because the mean of its divisors is an integer number (3843702720).

Almost surely, 2^686888888686 is an apocalyptic number.

686888888686 is an abundant number, since it is smaller than the sum of its proper divisors (789092955794).

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

686888888686 is a wasteful number, since it uses less digits than its factorization.

686888888686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352 (or 339 counting only the distinct ones).

The product of its digits is 21743271936, while the sum is 88.

The spelling of 686888888686 in words is "six hundred eighty-six billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, six hundred eighty-six".