How many blocks are in a GB

A Gigabyte (GB) has 8,589,934,592 bits and 1,073,741,824 bytes.
A byte is made up of 8 bits.
If the numbers look a little strange to you, it is because a kilobyte is not equal to 1000, it is equal to 1024 (which is the number 2 raised to the 10th power, 210 ).
A kilobyte is equal to 210, a Megabyte (MB) is equal to 220 and a Gigabyte is equal to 230.
Most of us are used to a base-10 system, but the base-2 (binary) system is common for usage in computers as are the base-8 (octal) and the base-16 (hexadecimal) systems.