With repetition, there are 86 ( = 262144) such numbers. Without repetition, there are still 8!/2! = 20160.
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irrational numbers
A complex number is a number of the form a + bi, where a and b are real numbers and i is the principal square root of -1. In the special case where b=0, a+0i=a. Hence every real number is also a complex number. And in the special case where a=0, we call those numbers pure imaginary numbers. Note that 0=0+0i, therefore 0 is both a real number and a pure imaginary number. Do not confuse the complex numbers with the pure imaginary numbers. Every real number is a complex number and every pure imaginary number is a complex number also.
Oh, absolutely, that's a number! Every combination of digits is a number, just waiting to be appreciated for its uniqueness. Embrace the beauty of numbers, my friend, for they are like little drops of paint on the canvas of mathematics.
Yes, the sum of any two even numbers is an even number. This means they are closed under addition. Closure Property: For every even number a, for every even number b, a + b is an even number.
Every number greater than 1 has the two factors 1 and the number itself.