Lately I have started to fall in love with...5040!

The opposite of a prime number is a "composite number". Primes being numbers not divisible by anything other than themselves and one.

Fifty forty is an example of an "extreme composite" number. Its divisible by EVERY integer from one through ten.

If I were supreme dictator I would tell them to stuff the metric system, but also to modify the Imperial system.

I would decree that a "mile" would no longer be 5280 feet, but would 5040 feet. That way you could easily reckon the number of feet in... half of a mile, third, forth, fifth, sixth, seventh, eighth, ninth, and a tenth of a mile. Would that be cool, or what?