It is a happy number.
999792780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is an unprimeable number.
Almost surely, 2999792780 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 999792780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1748791296).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
999792780 is a wasteful number, since it uses less digits than its factorization.
999792780 is an odious number, because the sum of its binary digits is odd.
The square root of 999792780 is about 31619.4999960467. The cubic root of 999792780 is about 999.9309218950.
The spelling of 999792780 in words is "nine hundred ninety-nine million, seven hundred ninety-two thousand, seven hundred eighty".