It depends a lot on the weight of the plane and how much derate you use.
There's a HUGE difference between a max-weight take-off with full derate and a light take-off with no derate.
I once used a gadget called a G-Tec to measure the horsepower of a 747 on take-off - it's a thing you can use in a car to measure the 1/4 mile time or power of a car, but it'll work on any machine - and I came up with roughly 100,000hp odd.
Perhaps not very accurate, but it'll be roughly right.