It is a tau number, because it is divible by the number of its divisors (120).
It is a congruent number.
It is an unprimeable number.
290720 is an apocalyptic number.
90720 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 90720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182952).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
90720 is a wasteful number, since it uses less digits than its factorization.
90720 is an evil number, because the sum of its binary digits is even.
The square root of 90720 is about 301.1976095523. The cubic root of 90720 is about 44.9332343233.
The spelling of 90720 in words is "ninety thousand, seven hundred twenty".