It is a nialpdrome in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 99999996.
It is a congruent number.
It is an unprimeable number.
Almost surely, 299999996 is an apocalyptic number.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
99999996 is a wasteful number, since it uses less digits than its factorization.
99999996 is an odious number, because the sum of its binary digits is odd.
The square root of 99999996 is about 9999.9998000000. Note that the first 3 decimals coincide. The cubic root of 99999996 is about 464.1588771725.
The spelling of 99999996 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-six".