I offer this notational suggestion, just to avoid either a floating-point or fractional constant:

3,560,000 * 2 ^ -12 ≈ 869.14

Based on: 1/2 ^ 12 = 2 ^ -12

That's much less clear if someone isn't aware of how negative exponents are defined. That's why I chose this notation, and why I put into words "cut in half 12 times."

> That's much less clear if someone isn't aware of how negative exponents are defined.

Yes, I've noticed that in other contexts. It's too bad because it makes the representation less clear, more complex than necessary. I first became aware of this when I tried to say that gravitational force declines as r^-2, to numerous protests.

Oh, well -- a tempest in a teapot, as they say.