73870 ÷ 4 = 18467 R2
Let's divide 73870 by 4.

Step 1:
4 goes into 7 1 times with a remainder of 3.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 4 from 7 to get 3.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 4

Step 2:
4 goes into 33 8 times with a remainder of 1.
Write down 8 as next digit of of the result. 
Result so far: 18
Subtract 32 from 33 to get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 4

Step 3:
4 goes into 18 4 times with a remainder of 2.
Write down 4 as next digit of of the result. 
Result so far: 184
Subtract 16 from 18 to get 2.
Bring next digit (7) of the dividend behind the 2 and repeat the process: 27 / 4

Step 4:
4 goes into 27 6 times with a remainder of 3.
Write down 6 as next digit of of the result. 
Result so far: 1846
Subtract 24 from 27 to get 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 4

Step 5:
4 goes into 30 7 times with a remainder of 2.
Write down 7 as next digit of of the result. 
Result so far: 18467
Subtract 28 from 30 to get 2.

The final result is 18467 with a remainder of 2.