It is a tau number, because it is divible by the number of its divisors (96).
It is a congruent number.
It is an unprimeable number.
73440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
273440 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 73440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136080).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
73440 is a wasteful number, since it uses less digits than its factorization.
73440 is an evil number, because the sum of its binary digits is even.
The square root of 73440 is about 270.9981549753. The cubic root of 73440 is about 41.8771922815.
Adding to 73440 its reverse (4437), we get a palindrome (77877).
The spelling of 73440 in words is "seventy-three thousand, four hundred forty", and thus it is an iban number.