Here is a conversion chart taken from The Bent of Tau Beta Pi
Spring 1988. Reprinted without permission.
10**12 Microphones = 1 Megaphone
10**6 bicycles = 2 megacycles
500 millinaries = 1 seminary
2000 mockingbirds = two kilomockingbirds
10 cards = 1 decacards
1/2 lavatory = 1 demijohn
10**-6 fish = 1 microfiche
453....