818128685 has 16 divisors (see below), whose sum is σ = 1074064320. Its totient is φ = 593303040.

The previous prime is 818128631. The next prime is 818128687. The reversal of 818128685 is 586821818.

818128685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-818128685 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818128687) 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, 1655 + ... + 40484.

It is an arithmetic number, because the mean of its divisors is an integer number (67129020).

Almost surely, 2^818128685 is an apocalyptic number.

It is an amenable number.

818128685 is a deficient number, since it is larger than the sum of its proper divisors (255935635).

818128685 is a wasteful number, since it uses less digits than its factorization.

818128685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42508.

The product of its digits is 245760, while the sum is 47.

The square root of 818128685 is about 28602.9488864348. The cubic root of 818128685 is about 935.2776149531.

The spelling of 818128685 in words is "eight hundred eighteen million, one hundred twenty-eight thousand, six hundred eighty-five".