It is a tau number, because it is divible by the number of its divisors (56).
It is a self number, because there is not a number n which added to its sum of digits gives 6720.
It is an unprimeable number.
26720 is an apocalyptic number.
6720 is a gapful number since it is divisible by the number (60) 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 6720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12192).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
6720 is a wasteful number, since it uses less digits than its factorization.
6720 is an evil number, because the sum of its binary digits is even.
The square root of 6720 is about 81.9756061277. The cubic root of 6720 is about 18.8707759213.
Adding to 6720 its reverse (276), we get a palindrome (6996).
The spelling of 6720 in words is "six thousand, seven hundred twenty".