Write the greatest and smallest $8-$digit numbers without repeating digits.

How many $3$-digit numbers can you form by using each of the digits $7, 8, 1$ only once?

Write all the numbers greater than $5000$ that can be formed by the following digits, do not repeat any digit in the same number.

$2, 3, 6, 4$

Write all the numbers greater than $5000$ that can be formed by the following digits, do not repeat any digit in the same number.

$0, 4, 8, 1$

Write all the numbers greater than $5000$ that can be formed by the following digits, do not repeat any digit in the same number:

$1, 2, 4, 7$

Rewrite the number using an international place-value chart. Also, write it's name in the international system:

$645723$

Rewrite the numbers using an international place-value chart. Also, write their name in the international system:

Rewrite the numbers using an international place-value chart. Also, write their name in the international system:

$74839825$

Rewrite the number using an international place-value chart. Also, write it's name in the international system:

$46027137$