Alright, let's work through 85709679 times 53583720 step by step
85709679 × 53583720 = 53583720 × (85709679)
+ 53583720 × 9 which equals 482253480
+ 53583720 × 70 producing 3750860400
+ 53583720 × 600 giving us 32150232000
+ 53583720 × 9000 what gives us 482253480000
+ 53583720 × 00000 that results in 0
+ 53583720 × 700000 producing 37508604000000
+ 53583720 × 5000000 that is equal 267918600000000
+ 53583720 × 80000000 that is equal 4286697600000000

= 4592643440825880
