Determine if a given integer is an Armstrong number (also known as a narcissistic number). An Armstrong number is a number that is equal to the sum of its own digits each raised to the power of the number of digits.
Examples:
Input: num = 153
Output: true
Explanation: 153 has 3 digits. 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153
Input: num = 9474
Output: true
Explanation: 9474 has 4 digits. 9^4 + 4^4 + 7^4 + 4^4 = 6561 + 256 + 2401 + 256 = 9474
Input: num = 123
Output: false
Explanation: 123 has 3 digits. 1^3 + 2^3 + 3^3 = 1 + 8 + 27 = 36, not equal to 123
Input: num = 0
Output: true
Explanation: 0 is considered an Armstrong number (0^1 = 0)
Input: num = -5
Output: false
Explanation: Negative numbers are not Armstrong numbers
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