Alright, let's work through 27643598 times 78758741 step by step
27643598 × 78758741 = 78758741 × (27643598)
+ 78758741 × 8 yielding 630069928
+ 78758741 × 90 that equals 7088286690
+ 78758741 × 500 resulting in 39379370500
+ 78758741 × 3000 which equals 236276223000
+ 78758741 × 40000 giving us 3150349640000
+ 78758741 × 600000 which equals 47255244600000
+ 78758741 × 7000000 that results in 551311187000000
+ 78758741 × 20000000 which equals 1575174820000000

= 2177174975190118
