It is a happy number.
It is a tau number, because it is divible by the number of its divisors (144).
It is a zygodrome in base 2.
It is a congruent number.
It is an unprimeable number.
2522720 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 522720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1005480).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
522720 is a wasteful number, since it uses less digits than its factorization.
522720 is an evil number, because the sum of its binary digits is even.
The square root of 522720 is about 722.9937759068. The cubic root of 522720 is about 80.5544813350.
Adding to 522720 its reverse (27225), we get a palindrome (549945).
The spelling of 522720 in words is "five hundred twenty-two thousand, seven hundred twenty".