Alright, let's work through 77421179 times 79957989 step by step
77421179 × 79957989 = 79957989 × (77421179)
+ 79957989 × 9 yielding 719621901
+ 79957989 × 70 that is equal 5597059230
+ 79957989 × 100 giving us 7995798900
+ 79957989 × 1000 that equals 79957989000
+ 79957989 × 20000 producing 1599159780000
+ 79957989 × 400000 resulting in 31983195600000
+ 79957989 × 7000000 resulting in 559705923000000
+ 79957989 × 70000000 that results in 5597059230000000

= 6190441778849031
