It is a congruent number.
It is an unprimeable number.
Almost surely, 2999961560 is an apocalyptic number.
999961560 is a gapful number since it is divisible by the number (90) formed by its first and last digit.
999961560 is the 44720-th triangular number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 999961560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1790989200).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
999961560 is a wasteful number, since it uses less digits than its factorization.
999961560 is an odious number, because the sum of its binary digits is odd.
The square root of 999961560 is about 31622.1688060765. The cubic root of 999961560 is about 999.9871865025.
The spelling of 999961560 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, five hundred sixty".