686779102 has 12 divisors (see below), whose sum is σ = 1066919256. Its totient is φ = 331547720.

The previous prime is 686779099. The next prime is 686779139. The reversal of 686779102 is 201977686.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 202474 + ... + 205837.

It is an arithmetic number, because the mean of its divisors is an integer number (88909938).

Almost surely, 2^686779102 is an apocalyptic number.

686779102 is a deficient number, since it is larger than the sum of its proper divisors (380140154).

686779102 is a wasteful number, since it uses less digits than its factorization.

686779102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408371 (or 408342 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 686779102 is about 26206.4706131902. The cubic root of 686779102 is about 882.2784885437.

The spelling of 686779102 in words is "six hundred eighty-six million, seven hundred seventy-nine thousand, one hundred two".