Number Gossip
(Enter a number and I'll tell you everything you wanted to know about it but were afraid to ask.)
Unique Properties of 480
- 480 is the smallest product abc such that (a+2)(b+2)(c+2) = 2abc (480 = 6*8*10 and 960 = 8*10*12)
- 480 is the smallest number such that when written in hexadecimal (1E0) looks like another number in scientific E notation
- 480 is the smallest integer area of an integer-sided triangle, where the lengths of two of the sides are cubes
Common Properties of 480
The number n is abundant if the sum of all its positive divisors except itself is more than n.
They are abundant above perfection, not to mention deficiency. See perfect and deficient numbers.
A positive integer greater than 1 that is not prime is called composite.
Composite numbers are opposite to prime numbers.
A number is even if it is divisible by 2.
Numbers that are not even are odd. Compare with another pair -- evil and odious numbers.
The number n is evil if it has an even number of 1's in its binary expansion.
Guess what odious numbers are.
The number n is practical if all numbers strictly less than n are sums of distinct divisors of n.