686444686 has 8 divisors (see below), whose sum is σ = 1029798504. Its totient is φ = 343178520.

The previous prime is 686444677. The next prime is 686444713.

It is a happy number.

686444686 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3616 + ... + 37228.

It is an arithmetic number, because the mean of its divisors is an integer number (128724813).

Almost surely, 2^686444686 is an apocalyptic number.

686444686 is a deficient number, since it is larger than the sum of its proper divisors (343353818).

686444686 is a wasteful number, since it uses less digits than its factorization.

686444686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43826.

The product of its digits is 5308416, while the sum is 52.

The square root of 686444686 is about 26200.0894273283. The cubic root of 686444686 is about 882.1352615368.

The spelling of 686444686 in words is "six hundred eighty-six million, four hundred forty-four thousand, six hundred eighty-six".