Oh, what a lovely question! To find the number of integers between 1000 and 9999 with all even digits, we can think of each digit place (ones, tens, hundreds, thousands) independently. In each place, we have 5 even digits to choose from (0, 2, 4, 6, 8). So, we have 5 choices for each of the 4 places, giving us a total of 5 x 5 x 5 x 5 = 625 integers with all even digits. Happy counting!
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952 of them.
An infinite amount
90 palindromes.
Highest is 9999, lowest is 1000. These and everything between them have four digits. Try subtracting 999 from 9999. If you can´t, there´s always wikianswers.
from 1000 to 9999, ie 9999 - 999 = 9000