Alright, let's work through 77900096 times 877517 step by step
77900096 × 877517 = 877517 × (77900096)
+ 877517 × 6 giving us 5265102
+ 877517 × 90 that equals 78976530
+ 877517 × 000 producing 0
+ 877517 × 0000 producing 0
+ 877517 × 00000 resulting in 0
+ 877517 × 900000 giving us 789765300000
+ 877517 × 7000000 what gives us 6142619000000
+ 877517 × 70000000 yielding 61426190000000

= 68358658541632
