Alright, let's work through 77132895 times 99709701 step by step
77132895 × 99709701 = 99709701 × (77132895)
+ 99709701 × 5 that equals 498548505
+ 99709701 × 90 what gives us 8973873090
+ 99709701 × 800 that results in 79767760800
+ 99709701 × 2000 what gives us 199419402000
+ 99709701 × 30000 what gives us 2991291030000
+ 99709701 × 100000 yielding 9970970100000
+ 99709701 × 7000000 which equals 697967907000000
+ 99709701 × 70000000 yielding 6979679070000000

= 7690897897714395
