If you're looking to invest $US1 in Bitcoin at the current value of $US28,000 per Bitcoin, you can calculate the amount you'll receive by dividing your investment by the Bitcoin price. In this case, $US1 divided by $US28,000 equals approximately 0.00003571 Bitcoin. Please note that the value of Bitcoin can fluctuate, and the amount you receive may vary depending on the current market price and the exchange you use.