6780 is an undulating number in base 15.
It is a congruent number.
26780 is an apocalyptic number.
6780 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 6780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9576).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
6780 is a wasteful number, since it uses less digits than its factorization.
6780 is an evil number, because the sum of its binary digits is even.
The square root of 6780 is about 82.3407554010. The cubic root of 6780 is about 18.9267726172.
The spelling of 6780 in words is "six thousand, seven hundred eighty".