We look at the division of 33810691 by 573 
The aim is to understand the frequency of 573 in 33810691.

On to step 1:
If we divide 3 by 573, we get 0 and a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Fetch the next digit (3) from the dividend, attach it to 3 and continue: 33 / 573

On to step 2:
33 divided by 573 is 0 with a remainder of 33.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 33, we end up with 33.
Bring next digit (8) of the dividend behind the 33 and repeat the process: 338 / 573

Going ahead to step 3:
573 goes into 338 0 times with a remainder of 338.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 338, we end up with 338.
Include the next digit (1) from the dividend after 338, then repeat: 3381 / 573

Let's proceed to step 4:
When dividing 3381 by 573, we get 5 with a remainder of 516.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we subtract 2865 from 3381, we get 516.
Bring next digit (0) of the dividend behind the 516 and repeat the process: 5160 / 573

Advancing to step 5:
573 goes into 5160 9 times with a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 59.0
If we subtract 5157 from 5160, we get 3.
Include the next digit (6) from the dividend after 3, then repeat: 36 / 573

Let's proceed to step 6:
573 goes into 36 0 times with a remainder of 36.
The next digit of our result is 0. 
Result so far: 590.0
The remainder is 36 after subtracting 0 from 36.
Grab the next digit (9) from the dividend, add it to 36, then carry on: 369 / 573

On to step 7:
369 divided by 573 is 0 with a remainder of 369.
Use 0 as the next digit of our solution. 
Result so far: 5900.0
Deduct 0 from 369 and we're left with 369.
Include the next digit (1) from the dividend after 369, then repeat: 3691 / 573

On to step 8:
573 goes into 3691 6 times with a remainder of 253.
The number 6 becomes the next digit in our result. 
Result so far: 59006.0
Subtracting 3438 from 3691 leaves us with 253.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2530, and continue the process.

On to step 9:
573 goes into 2530 4 times with a remainder of 238.
The number 4 becomes the next digit in our result. 
Result so far: 59006.4
If we subtract 2292 from 2530, we get 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

Step 10:
573 can be fit into 2380 4 times, resulting in a remainder of 88.
The next digit of our result is 4. 
Result so far: 59006.44
Deduct 2292 from 2380 and we're left with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

The quotient of the division is 59006.44, and the remainder is 0.088.