685217126 has 16 divisors (see below), whose sum is σ = 1147341888. Its totient is φ = 304218600.

The previous prime is 685217123. The next prime is 685217179. The reversal of 685217126 is 621712586.

It is a self number, because there is not a number n which added to its sum of digits gives 685217126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685217123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361220 + ... + 363111.

It is an arithmetic number, because the mean of its divisors is an integer number (71708868).

Almost surely, 2^685217126 is an apocalyptic number.

685217126 is a deficient number, since it is larger than the sum of its proper divisors (462124762).

685217126 is a wasteful number, since it uses less digits than its factorization.

685217126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724387.

The product of its digits is 40320, while the sum is 38.

The square root of 685217126 is about 26176.6523069700. The cubic root of 685217126 is about 881.6091108154.

The spelling of 685217126 in words is "six hundred eighty-five million, two hundred seventeen thousand, one hundred twenty-six".