Adding to 77220 its reverse (2277), we get a palindrome (79497).
It is a nialpdrome in base 10.
It is a zygodrome in base 8.
It is a congruent number.
It is an unprimeable number.
77220 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
277220 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 77220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141120).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
77220 is a wasteful number, since it uses less digits than its factorization.
77220 is an evil number, because the sum of its binary digits is even.
The square root of 77220 is about 277.8848682458. The cubic root of 77220 is about 42.5836874659.
The spelling of 77220 in words is "seventy-seven thousand, two hundred twenty", and thus it is an iban number.