Alright, let's work through 77980344 times 69743063 step by step
77980344 × 69743063 = 69743063 × (77980344)
+ 69743063 × 4 giving us 278972252
+ 69743063 × 40 that equals 2789722520
+ 69743063 × 300 that equals 20922918900
+ 69743063 × 0000 that is equal 0
+ 69743063 × 80000 that is equal 5579445040000
+ 69743063 × 900000 that results in 62768756700000
+ 69743063 × 7000000 yielding 488201441000000
+ 69743063 × 70000000 what gives us 4882014410000000

= 5438588044353672
