Alright, let's work through 79738871 times 1561387 step by step
79738871 × 1561387 = 1561387 × (79738871)
+ 1561387 × 1 that results in 1561387
+ 1561387 × 70 that equals 109297090
+ 1561387 × 800 yielding 1249109600
+ 1561387 × 8000 what gives us 12491096000
+ 1561387 × 30000 resulting in 46841610000
+ 1561387 × 700000 what gives us 1092970900000
+ 1561387 × 9000000 which equals 14052483000000
+ 1561387 × 70000000 that results in 109297090000000

= 124503236574077
