1643813985

Names of 1643813985

• Cardinal: 1643813985 can be written as One billion, six hundred forty-three million, eight hundred thirteen thousand, nine hundred eighty-five.

Scientific notation

• Scientific notation: 1.643813985 × 10⁹

Factors of 1643813985

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 269313

Divisors of 1643813985

• Number of divisors d(n): 32
• Complete list of divisors:
  1 3 5 11 15 33 37 55 111 165 185 407 555 1221 2035 6105 269257 807771 1346285 2961827 4038855 8885481 9962509 14809135 29887527 44427405 49812545 109587599 149437635 328762797 547937995 1643813985
• Sum of all divisors σ(n): 2946759552
• Sum of proper divisors (its aliquot sum) s(n): 1302945567
• 1643813985 is a deficient number, because the sum of its proper divisors (1302945567) is less than itself. Its deficiency is 340868418

Bases of 1643813985

• Binary: 1100001111110101001110001100001₂
• Hexadecimal: 0x61FA9C61
• Base-36: R6OMZL

Squares and roots of 1643813985

• 1643813985 squared (1643813985²) is 2702124417281580225
• 1643813985 cubed (1643813985³) is 4441789906337437256754446625
• The square root of 1643813985 is 40543.9759397127
• The cube root of 1643813985 is 1180.1871734591

Scales and comparisons

• 1,643,813,985 seconds is equal to 52 years, 13 weeks, 6 days, 14 hours, 59 minutes, 45 seconds.
• To count from 1 to 1,643,813,985 would take you about one hundred four 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 1643813985 cubic inches would be around 98.3 feet tall.

Recreational maths with 1643813985

• 1643813985 backwards is 5893183461
• The number of decimal digits it has is: 10
• The sum of 1643813985's digits is 48
• More coming soon!