It is a tau number, because it is divible by the number of its divisors (420).
It is an unprimeable number.
Almost surely, 291445760 is an apocalyptic number.
91445760 is a gapful number since it is divisible by the number (90) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 91445760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191201769).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
91445760 is an frugal number, since it uses more digits than its factorization.
91445760 is an odious number, because the sum of its binary digits is odd.
The square root of 91445760 is about 9562.7276443492. The cubic root of 91445760 is about 450.5273816887.
The spelling of 91445760 in words is "ninety-one million, four hundred forty-five thousand, seven hundred sixty".