The square root of 90000 is 300.
It is a tau number, because it is divible by the number of its divisors (75).
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is a Duffinian number.
It is a nialpdrome in base 10 and base 12.
90000 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
290000 is an apocalyptic number.
90000 is a gapful number since it is divisible by the number (90) formed by its first and last digit.
90000 is the 300-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 90000
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
90000 is a wasteful number, since it uses less digits than its factorization.
90000 is an odious number, because the sum of its binary digits is odd.
The cubic root of 90000 is about 44.8140474656.
The spelling of 90000 in words is "ninety thousand".