813673685 has 16 divisors (see below), whose sum is σ = 1065744000. Its totient is φ = 591445440.

The previous prime is 813673681. The next prime is 813673711. The reversal of 813673685 is 586376318.

It is a happy number.

It is not a de Polignac number, because 813673685 - 2² = 813673681 is a prime.

It is a super-2 number, since 2×813673685² = 1324129731322958450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813673681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162479 + ... + 167411.

It is an arithmetic number, because the mean of its divisors is an integer number (66609000).

Almost surely, 2^813673685 is an apocalyptic number.

It is an amenable number.

813673685 is a deficient number, since it is larger than the sum of its proper divisors (252070315).

813673685 is a wasteful number, since it uses less digits than its factorization.

813673685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7948.

The product of its digits is 725760, while the sum is 47.

The square root of 813673685 is about 28524.9659947212. The cubic root of 813673685 is about 933.5768850653.

The spelling of 813673685 in words is "eight hundred thirteen million, six hundred seventy-three thousand, six hundred eighty-five".