Alright, let's work through 85798731 times 7909438 step by step
85798731 × 7909438 = 7909438 × (85798731)
+ 7909438 × 1 that equals 7909438
+ 7909438 × 30 which equals 237283140
+ 7909438 × 700 which equals 5536606600
+ 7909438 × 8000 giving us 63275504000
+ 7909438 × 90000 giving us 711849420000
+ 7909438 × 700000 that equals 5536606600000
+ 7909438 × 5000000 that results in 39547190000000
+ 7909438 × 80000000 yielding 632755040000000

= 678619743323178
