Alright, let's work through 77621368 times 91478158 step by step
77621368 × 91478158 = 91478158 × (77621368)
+ 91478158 × 8 yielding 731825264
+ 91478158 × 60 giving us 5488689480
+ 91478158 × 300 which equals 27443447400
+ 91478158 × 1000 yielding 91478158000
+ 91478158 × 20000 resulting in 1829563160000
+ 91478158 × 600000 that equals 54886894800000
+ 91478158 × 7000000 that results in 640347106000000
+ 91478158 × 70000000 that equals 6403471060000000

= 7100659766080144
