Alright, let's work through 84637318 times 64746512 step by step
84637318 × 64746512 = 64746512 × (84637318)
+ 64746512 × 8 giving us 517972096
+ 64746512 × 10 that results in 647465120
+ 64746512 × 300 resulting in 19423953600
+ 64746512 × 7000 which equals 453225584000
+ 64746512 × 30000 that is equal 1942395360000
+ 64746512 × 600000 resulting in 38847907200000
+ 64746512 × 4000000 yielding 258986048000000
+ 64746512 × 80000000 which equals 5179720960000000

= 5479971125534816
