686747686 has 4 divisors (see below), whose sum is σ = 1030121532. Its totient is φ = 343373842.

The previous prime is 686747683. The next prime is 686747687.

It is a happy number.

686747686 is nontrivially palindromic in base 10.

686747686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 686747686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686747683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171686920 + ... + 171686923.

It is an arithmetic number, because the mean of its divisors is an integer number (257530383).

Almost surely, 2^686747686 is an apocalyptic number.

686747686 is a deficient number, since it is larger than the sum of its proper divisors (343373846).

686747686 is a wasteful number, since it uses less digits than its factorization.

686747686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343373845.

The product of its digits is 16257024, while the sum is 58.

The square root of 686747686 is about 26205.8712123829. The cubic root of 686747686 is about 882.2650353661.

The spelling of 686747686 in words is "six hundred eighty-six million, seven hundred forty-seven thousand, six hundred eighty-six".