685606985 has 8 divisors (see below), whose sum is σ = 940261056. Its totient is φ = 470130480.

The previous prime is 685606949. The next prime is 685606997. The reversal of 685606985 is 589606586.

It is a happy number.

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

It is not a de Polignac number, because 685606985 - 2¹⁰ = 685605961 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 9794351 + ... + 9794420.

It is an arithmetic number, because the mean of its divisors is an integer number (117532632).

Almost surely, 2^685606985 is an apocalyptic number.

It is an amenable number.

685606985 is a deficient number, since it is larger than the sum of its proper divisors (254654071).

685606985 is a wasteful number, since it uses less digits than its factorization.

685606985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19588783.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The square root of 685606985 is about 26184.0979413078. The cubic root of 685606985 is about 881.7762783062.

The spelling of 685606985 in words is "six hundred eighty-five million, six hundred six thousand, nine hundred eighty-five".