Alright, let's work through 73379447 times 81510409 step by step
73379447 × 81510409 = 81510409 × (73379447)
+ 81510409 × 7 which equals 570572863
+ 81510409 × 40 what gives us 3260416360
+ 81510409 × 400 resulting in 32604163600
+ 81510409 × 9000 yielding 733593681000
+ 81510409 × 70000 yielding 5705728630000
+ 81510409 × 300000 that results in 24453122700000
+ 81510409 × 3000000 yielding 244531227000000
+ 81510409 × 70000000 resulting in 5705728630000000

= 5981188737163823
