224640 is a `hidden beast` number, since 2 + 24 + 640 = 666.
It is a tau number, because it is divible by the number of its divisors (128).
It is a nialpdrome in base 8 and base 12.
It is a zygodrome in base 8 and base 12.
It is a congruent number.
It is an unprimeable number.
224640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2224640 is an apocalyptic number.
224640 is a gapful number since it is divisible by the number (20) 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 224640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (428400).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
224640 is a wasteful number, since it uses less digits than its factorization.
224640 is an evil number, because the sum of its binary digits is even.
The square root of 224640 is about 473.9620237952. The cubic root of 224640 is about 60.7895642292.
224640 divided by its product of nonzero digits (384) gives a palindrome (585).
The spelling of 224640 in words is "two hundred twenty-four thousand, six hundred forty".