Multiple choice general knowledge math & puzzles Which one is the ARMSTRONG NUMBER 470 370 580 180 Reveal answer Fill a bubble to check yourself B Correct answer Explanation An Armstrong number (for 3 digits) is a number equal to the sum of the cubes of its digits. For 370: 3^3 + 7^3 + 0^3 = 27 + 343 + 0 = 370. Thus, 370 is an Armstrong number.