686328655 has 16 divisors (see below), whose sum is σ = 833152320. Its totient is φ = 542711808.

The previous prime is 686328653. The next prime is 686328667. The reversal of 686328655 is 556823686.

686328655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 686328655 - 2¹ = 686328653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 686328599 and 686328608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686328653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 395169 + ... + 396901.

It is an arithmetic number, because the mean of its divisors is an integer number (52072020).

Almost surely, 2^686328655 is an apocalyptic number.

686328655 is a deficient number, since it is larger than the sum of its proper divisors (146823665).

686328655 is a wasteful number, since it uses less digits than its factorization.

686328655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610.

The product of its digits is 2073600, while the sum is 49.

The square root of 686328655 is about 26197.8750092445. The cubic root of 686328655 is about 882.0855557575.

The spelling of 686328655 in words is "six hundred eighty-six million, three hundred twenty-eight thousand, six hundred fifty-five".