It is a tau number, because it is divible by the number of its divisors (36).
It is a nialpdrome in base 6 and base 10.
It is a zygodrome in base 2 and base 6.
It is a congruent number.
7740 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
27740 is an apocalyptic number.
7740 is the 72-nd pentagonal number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 7740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12012).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
7740 is a wasteful number, since it uses less digits than its factorization.
7740 is an evil number, because the sum of its binary digits is even.
The square root of 7740 is about 87.9772697917. The cubic root of 7740 is about 19.7809427900.
The spelling of 7740 in words is "seven thousand, seven hundred forty", and thus it is an iban number.