685198806 has 32 divisors (see below), whose sum is σ = 1433714688. Its totient is φ = 218084160.

The previous prime is 685198799. The next prime is 685198817. The reversal of 685198806 is 608891586.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18070 + ... + 41193.

It is an arithmetic number, because the mean of its divisors is an integer number (44803584).

Almost surely, 2^685198806 is an apocalyptic number.

685198806 is an abundant number, since it is smaller than the sum of its proper divisors (748515882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685198806 is a wasteful number, since it uses less digits than its factorization.

685198806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59356.

The product of its (nonzero) digits is 829440, while the sum is 51.

The square root of 685198806 is about 26176.3023744760. The cubic root of 685198806 is about 881.6012538300.

The spelling of 685198806 in words is "six hundred eighty-five million, one hundred ninety-eight thousand, eight hundred six".