Adding to 55440 its reverse (4455), we get a palindrome (59895).
It is a happy number.
It is a tau number, because it is divible by the number of its divisors (120).
It is a nialpdrome in base 10.
It is a zygodrome in base 3.
55440 is a highly composite number, because it has more divisors than any smaller number.
55440 is a superabundant number, because it has a larger abundancy index than any smaller number.
255440 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 55440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116064).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
55440 is a wasteful number, since it uses less digits than its factorization.
55440 is an evil number, because the sum of its binary digits is even.
The square root of 55440 is about 235.4570024442. The cubic root of 55440 is about 38.1306674366.
The spelling of 55440 in words is "fifty-five thousand, four hundred forty".