It is a tau number, because it is divible by the number of its divisors (96).
It is a nude number because it is divisible by every one of its digits.
It is an unprimeable number.
Almost surely, 2999999648 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 999999648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1461247200).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
999999648 is a wasteful number, since it uses less digits than its factorization.
999999648 is an evil number, because the sum of its binary digits is even.
The square root of 999999648 is about 31622.7710360746. The cubic root of 999999648 is about 999.9998826667. Note that the first 3 decimals are identical.
The spelling of 999999648 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred forty-eight".