Multipling 8720 by its sum of digits (17), we get a triangular number (148240 = T544).
Adding to 8720 its reverse (278), we get a palindrome (8998).
It is a tau number, because it is divible by the number of its divisors (20).
It is a nialpdrome in base 10 and base 16.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 8720.
It is an unprimeable number.
8720 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 8720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10230).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
8720 is a wasteful number, since it uses less digits than its factorization.
8720 is an odious number, because the sum of its binary digits is odd.
The square root of 8720 is about 93.3809402394. The cubic root of 8720 is about 20.5828493314.
The spelling of 8720 in words is "eight thousand, seven hundred twenty".