91728 divided by its product of digits (1008) gives a triangular number (91 = T13).
Subtracting from 91728 its reverse (82719), we obtain a palindrome (9009).
It is a zygodrome in base 3.
It is a congruent number.
It is an unprimeable number.
91728 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
291728 is an apocalyptic number.
91728 is a gapful number since it is divisible by the number (98) 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 91728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160797).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
91728 is a wasteful number, since it uses less digits than its factorization.
91728 is an odious number, because the sum of its binary digits is odd.
The square root of 91728 is about 302.8663071390. The cubic root of 91728 is about 45.0990411184.
The spelling of 91728 in words is "ninety-one thousand, seven hundred twenty-eight".