Alright, let's work through 77864618 times 61978842 step by step
77864618 × 61978842 = 61978842 × (77864618)
+ 61978842 × 8 resulting in 495830736
+ 61978842 × 10 that equals 619788420
+ 61978842 × 600 producing 37187305200
+ 61978842 × 4000 that results in 247915368000
+ 61978842 × 60000 that equals 3718730520000
+ 61978842 × 800000 that results in 49583073600000
+ 61978842 × 7000000 giving us 433851894000000
+ 61978842 × 70000000 that equals 4338518940000000

= 4825958856412356
