7777 is nontrivially palindromic in base 6 and base 10.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is a nude number because it is divisible by every one of its digits.
It is a deceptive number, since it divides R7776.
It is a Duffinian number.
7777 is a nontrivial repdigit in base 10.
It is a plaindrome in base 10.
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is a Kaprekar number, because its square (60481729) can be partitioned into two parts whose sum is 7777.
27777 is an apocalyptic number.
7777 is a gapful number since it is divisible by the number (77) formed by its first and last digit.
It is an amenable number.
7777 is a wasteful number, since it uses less digits than its factorization.
7777 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 119.
The square root of 7777 is about 88.1873006731. The cubic root of 7777 is about 19.8124127181.
The spelling of 7777 in words is "seven thousand, seven hundred seventy-seven", and is thus an iban number.