685838673 has 18 divisors (see below), whose sum is σ = 1072724406. Its totient is φ = 422053632.

The previous prime is 685838653. The next prime is 685838683. The reversal of 685838673 is 376838586.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 82301184 + 603537489 = 9072^2 + 24567^2 .

It is not a de Polignac number, because 685838673 - 2⁵ = 685838641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685838653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 223936 + ... + 226977.

Almost surely, 2^685838673 is an apocalyptic number.

It is an amenable number.

685838673 is a deficient number, since it is larger than the sum of its proper divisors (386885733).

685838673 is a wasteful number, since it uses less digits than its factorization.

685838673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450945 (or 450929 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 685838673 is about 26188.5217795889. The cubic root of 685838673 is about 881.8755936955.

The spelling of 685838673 in words is "six hundred eighty-five million, eight hundred thirty-eight thousand, six hundred seventy-three".