No problem, we've got 2178 and 7720 to multiply
2178 × 7720 = 7720 × (2178)
+ 7720 × 8 which equals 61760
+ 7720 × 70 what gives us 540400
+ 7720 × 100 that is equal 772000
+ 7720 × 2000 resulting in 15440000

= 16814160
