It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is a plaindrome in base 12.
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is a congruent number.
27700 is an apocalyptic number.
7700 is a gapful number since it is divisible by the number (70) 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 7700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10416).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
7700 is a wasteful number, since it uses less digits than its factorization.
7700 is an evil number, because the sum of its binary digits is even.
The square root of 7700 is about 87.7496438739. The cubic root of 7700 is about 19.7468082221.
Adding to 7700 its reverse (77), we get a palindrome (7777).
Multiplying 7700 by its reverse (77), we get a square (592900 = 7702).
7700 divided by its reverse (77) gives a square (100 = 102).
The spelling of 7700 in words is "seven thousand, seven hundred", and thus it is an iban number.