686767686 has 24 divisors (see below), whose sum is σ = 1509755352. Its totient is φ = 208111200.

The previous prime is 686767667. The next prime is 686767747.

686767686 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 472255 + ... + 473706.

It is an arithmetic number, because the mean of its divisors is an integer number (62906473).

Almost surely, 2^686767686 is an apocalyptic number.

686767686 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

686767686 is an abundant number, since it is smaller than the sum of its proper divisors (822987666).

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

686767686 is a wasteful number, since it uses less digits than its factorization.

686767686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945988 (or 945977 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 60.

The square root of 686767686 is about 26206.2528034818. The cubic root of 686767686 is about 882.2735999524.

The spelling of 686767686 in words is "six hundred eighty-six million, seven hundred sixty-seven thousand, six hundred eighty-six".