686222686 has 4 divisors (see below), whose sum is σ = 1029334032. Its totient is φ = 343111342.

The previous prime is 686222659. The next prime is 686222707.

686222686 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171555670 + ... + 171555673.

It is an arithmetic number, because the mean of its divisors is an integer number (257333508).

Almost surely, 2^686222686 is an apocalyptic number.

686222686 is a deficient number, since it is larger than the sum of its proper divisors (343111346).

686222686 is a wasteful number, since it uses less digits than its factorization.

686222686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343111345.

The product of its digits is 663552, while the sum is 46.

The square root of 686222686 is about 26195.8524579751. The cubic root of 686222686 is about 882.0401554794.

The spelling of 686222686 in words is "six hundred eighty-six million, two hundred twenty-two thousand, six hundred eighty-six".