646

Names of 646

• Cardinal: 646 can be written as Six hundred forty-six.

Scientific notation

• Scientific notation: 6.46 × 10²

Factors of 646

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 38

Divisors of 646

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 17 19 34 38 323 646
• Sum of all divisors σ(n): 1080
• Sum of proper divisors (its aliquot sum) s(n): 434
• 646 is a deficient number, because the sum of its proper divisors (434) is less than itself. Its deficiency is 212

Bases of 646

• Binary: 1010000110₂
• Hexadecimal: 0x286
• Base-36: HY

Squares and roots of 646

• 646 squared (646²) is 417316
• 646 cubed (646³) is 269586136
• The square root of 646 is 25.4165300543
• The cube root of 646 is 8.6445854719

Scales and comparisons

• 646 seconds is equal to 10 minutes, 46 seconds.
• To count from 1 to 646 would take you about five minutes.

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 646 cubic inches would be around 0.7 feet tall.

Recreational maths with 646

• 646 is the same when its digits are reversed! That makes it a palindromic number.
• The number of decimal digits it has is: 3
• The sum of 646's digits is 16
• More coming soon!