Adding to 44640 its reverse (4644), we get a square (49284 = 2222).
It is a tau number, because it is divible by the number of its divisors (72).
It is a d-powerful number, because it can be written as 46 + 47 + 65 + 47 + 0 .
It is a congruent number.
44640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
244640 is an apocalyptic number.
44640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 44640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78624).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
44640 is a wasteful number, since it uses less digits than its factorization.
44640 is an odious number, because the sum of its binary digits is odd.
The square root of 44640 is about 211.2818023399. The cubic root of 44640 is about 35.4738284920.
The spelling of 44640 in words is "forty-four thousand, six hundred forty".