There are some caveats to comparing the computing power of the brain to computers. Computers have vastly more serial processing power than the brain. Transistors are thousands to millions of times faster than neurons. Signals propagate through the brain relatively slowly (only about 200 times per second.) For problems that can be done iteratively, computers are vastly superior.

Second computers are intentionally designed to be general purpose and they sacrifice a lot of potential speed to do this. If you were to build some algorithms into the hardware they would get vastly more performance (eg bitcoin mining), but that's extremely expensive. However being general purpose has a lot of advantages. Computers will always be faster at many things than neurons.