It is a congruent number.
Almost surely, 29965880 is an apocalyptic number.
9965880 is a gapful number since it is divisible by the number (90) formed by its first and last digit.
9965880 is the 4464-th triangular number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 9965880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17971200).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
9965880 is a wasteful number, since it uses less digits than its factorization.
9965880 is an evil number, because the sum of its binary digits is even.
The square root of 9965880 is about 3156.8782048093. The cubic root of 9965880 is about 215.1981587530.
The spelling of 9965880 in words is "nine million, nine hundred sixty-five thousand, eight hundred eighty".