640809105

Names of 640809105

• Cardinal: 640809105 can be written as Six hundred forty million, eight hundred nine thousand, one hundred five.

Scientific notation

• Scientific notation: 6.40809105 × 10⁸

Factors of 640809105

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 1038

Divisors of 640809105

• Number of divisors d(n): 64
• Complete list of divisors:
  1 3 5 15 19 37 57 67 95 111 185 201 285 335 555 703 907 1005 1273 2109 2479 2721 3515 3819 4535 6365 7437 10545 12395 13605 17233 19095 33559 37185 47101 51699 60769 86165 100677 141303 167795 182307 235505 258495 303845 503385 637621 706515 911535 1154611 1912863 2248453 3188105 3463833 5773055 6745359 9564315 11242265 17319165 33726795 42720607 128161821 213603035 640809105
• Sum of all divisors σ(n): 1126210560
• Sum of proper divisors (its aliquot sum) s(n): 485401455
• 640809105 is a deficient number, because the sum of its proper divisors (485401455) is less than itself. Its deficiency is 155407650

Bases of 640809105

• Binary: 100110001100011111100010010001₂
• Hexadecimal: 0x2631F891
• Base-36: ALIRGX

Squares and roots of 640809105

• 640809105 squared (640809105²) is 410636309050901025
• 640809105 cubed (640809105³) is 263139485683411285273832625
• The square root of 640809105 is 25314.2075720337
• The cube root of 640809105 is 862.1368822235

Scales and comparisons

• 640,809,105 seconds is equal to 20 years, 19 weeks, 3 days, 18 hours, 31 minutes, 45 seconds.
• To count from 1 to 640,809,105 would take you about thirty years!

  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 640809105 cubic inches would be around 71.8 feet tall.

Recreational maths with 640809105

• 640809105 backwards is 501908046
• The number of decimal digits it has is: 9
• The sum of 640809105's digits is 33
• More coming soon!