999996688 has 20 divisors (see below), whose sum is σ = 1940736028. Its totient is φ = 499161600.

The previous prime is 999996677. The next prime is 999996689. The reversal of 999996688 is 886699999.

It can be written as a sum of positive squares in 2 ways, for example, as 364351744 + 635644944 = 19088^2 + 25212^2 .

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 999996688.

It is not an unprimeable number, because it can be changed into a prime (999996689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42381 + ... + 61612.

Almost surely, 2^999996688 is an apocalyptic number.

It is an amenable number.

999996688 is a deficient number, since it is larger than the sum of its proper divisors (940739340).

999996688 is a wasteful number, since it uses less digits than its factorization.

999996688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104602 (or 104596 counting only the distinct ones).

The product of its digits is 136048896, while the sum is 73.

The square root of 999996688 is about 31622.7242343224. The cubic root of 999996688 is about 999.9988959988.

The spelling of 999996688 in words is "nine hundred ninety-nine million, nine hundred ninety-six thousand, six hundred eighty-eight".