Subtracting 77778 from its reverse (87777), we obtain a palindrome (9999).
77778 is nontrivially palindromic in base 8.
It is a Curzon number.
It is a plaindrome in base 10.
It is a zygodrome in base 8.
77778 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a Kaprekar number, because its square (6049417284) can be partitioned into two parts whose sum is 77778.
277778 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 77778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87750).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
77778 is a wasteful number, since it uses less digits than its factorization.
77778 is an evil number, because the sum of its binary digits is even.
The square root of 77778 is about 278.8870739206. The cubic root of 77778 is about 42.6860128195.
The spelling of 77778 in words is "seventy-seven thousand, seven hundred seventy-eight".