I have nine digits. The digit in the tens place is the value of any number times zero. The value of one of the digits is 40,000. The value of the hundred-thousands place is ten times the digit in the ten-thousand place. The digit in the millions place is the sum of the two digits to its right. The digit in the hundred place is half the digit in the ten thousands place. The digit in the thousands place is one-tenth the value of the digit in the hundreds place. The digit in the hundred millions place is the difference between the digit in the hundreds place and the digit in the tens place. The digit in the ones place is the number of days in a week. The digit in the ten millions place is half of one dozen.

Just work through the instructions. I'll get you started, but I'm sure you can read as well as I. Start with

xxx,xxx,xxx

The digit in the tens place is the value of any number times zero.
xxx,xxx,x0x

The value of the hundred-thousands place is ten times the digit in the ten-thousand place. Since each digit must be less than ten, that means you must have
xxx,00x,x0x

And so on. Analyze each sentence and what it means numerically. You might have to take some sentences out of order to nail down the digits.

Oh, wait. I misread the 2nd clue. It just means that both those digits are the same, since it said "value".

Let's break down the clues given to find the values of the digits:

1. The digit in the tens place is the value of any number times zero.
This means the digit in the tens place is 0.

2. The value of one of the digits is 40,000.
This tells us that one of the digits is 4 and it is in the ten thousands place.

3. The value of the hundred-thousands place is ten times the digit in the ten-thousand place.
We know the digit in the ten thousands place is 4. Therefore, the digit in the hundred thousands place is 10 times 4, which is 40.

4. The digit in the millions place is the sum of the two digits to its right.
Since we already have the values of the digits in the ten thousands (4) and the hundred thousands (40), we can conclude that the digit in the millions place is 4 + 0 = 4.

5. The digit in the hundred place is half the digit in the ten thousands place.
We know the digit in the ten thousands place is 4. Therefore, the digit in the hundred place is half of 4, which is 2.

6. The digit in the thousands place is one-tenth the value of the digit in the hundreds place.
We know the digit in the hundreds place is 2. Therefore, the digit in the thousands place is one-tenth of 2, which is 0.2. However, since we are dealing with whole digits, we round it to the nearest whole number, which is 0. So, the digit in the thousands place is 0.

7. The digit in the hundred millions place is the difference between the digit in the hundreds place and the digit in the tens place.
We know the digit in the hundreds place is 2 and the digit in the tens place is 0. Therefore, the digit in the hundred millions place is 2 - 0 = 2.

8. The digit in the ones place is the number of days in a week.
There are 7 days in a week, so the digit in the ones place is 7.

9. The digit in the ten millions place is half of one dozen.
One dozen is equal to 12, so half of one dozen is 12 divided by 2, which is 6. Therefore, the digit in the ten millions place is 6.

Putting all the digits together, we have the following nine-digit number: 624,004,702.