No problem, we've got 5031 and 7870 to multiply
5031 × 7870 = 7870 × (5031)
+ 7870 × 1 yielding 7870
+ 7870 × 30 which equals 236100
+ 7870 × 000 what gives us 0
+ 7870 × 5000 yielding 39350000

= 39593970
