685686586 has 16 divisors (see below), whose sum is σ = 1108939104. Its totient is φ = 316101744.

The previous prime is 685686581. The next prime is 685686593.

It is a happy number.

685686586 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 685686586.

It is not an unprimeable number, because it can be changed into a prime (685686581) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8025 + ... + 37891.

It is an arithmetic number, because the mean of its divisors is an integer number (69308694).

Almost surely, 2^685686586 is an apocalyptic number.

685686586 is a deficient number, since it is larger than the sum of its proper divisors (423252518).

685686586 is a wasteful number, since it uses less digits than its factorization.

685686586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30765.

The product of its digits is 16588800, while the sum is 58.

The square root of 685686586 is about 26185.6179228217. The cubic root of 685686586 is about 881.8104025974.

The spelling of 685686586 in words is "six hundred eighty-five million, six hundred eighty-six thousand, five hundred eighty-six".