It is a tau number, because it is divible by the number of its divisors (80).
It is a nialpdrome in base 16.
It is a congruent number.
Almost surely, 29978640 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 9978640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13463424).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
9978640 is a wasteful number, since it uses less digits than its factorization.
9978640 is an odious number, because the sum of its binary digits is odd.
The square root of 9978640 is about 3158.8985422137. The cubic root of 9978640 is about 215.2899639057.
The spelling of 9978640 in words is "nine million, nine hundred seventy-eight thousand, six hundred forty".