It is a congruent number.
290804 is an apocalyptic number.
90804 is a gapful number since it is divisible by the number (94) 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 90804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129024).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
90804 is a wasteful number, since it uses less digits than its factorization.
90804 is an evil number, because the sum of its binary digits is even.
The square root of 90804 is about 301.3370206264. The cubic root of 90804 is about 44.9470983274.
The spelling of 90804 in words is "ninety thousand, eight hundred four".