It is a self number, because there is not a number n which added to its sum of digits gives 81600.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81600.
It is an unprimeable number.
81600 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
281600 is an apocalyptic number.
81600 is a gapful number since it is divisible by the number (80) 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 81600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141732).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
81600 is a wasteful number, since it uses less digits than its factorization.
81600 is an evil number, because the sum of its binary digits is even.
The square root of 81600 is about 285.6571371417. The cubic root of 81600 is about 43.3740577050.
The spelling of 81600 in words is "eighty-one thousand, six hundred".