638945916378

Names of 638945916378

• Cardinal: 638945916378 can be written as Six hundred thirty-eight billion, nine hundred forty-five million, nine hundred sixteen thousand, three hundred seventy-eight.

Scientific notation

• Scientific notation: 6.38945916378 × 10¹¹

Factors of 638945916378

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 21252

Divisors of 638945916378

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 6 7 11 14 21 22 33 42 66 73 77 146 154 219 231 438 462 511 803 937 1022 1533 1606 1874 2409 2811 3066 4818 5621 5622 6559 10307 11242 13118 16863 19677 20219 20614 30921 33726 39354 40438 60657 61842 68401 72149 121314 136802 141533 144298 205203 216447 222409 283066 410406 424599 432894 444818 478807 667227 752411 849198 957614 1334454 1436421 1475987 1504822 1556863 2257233 2872842 2951974 3113726 4427961 4514466 4670589 5266877 8855922 9341178 10331909 10533754 15800631 16235857 18945203 20663818 30995727 31601262 32471714 37890406 48707571 56835609 61991454 97415142 113650999 113671218 132616421 208397233 227301998 265232842 340952997 397849263 416794466 625191699 681905994 795698526 1250383398 1382999819 1458780631 2765999638 2917561262 4148999457 4376341893 8297998914 8752683786 9680998733 15212998009 19361997466 29042996199 30425996018 45638994027 58085992398 91277988054 106490986063 212981972126 319472958189 638945916378
• Sum of all divisors σ(n): 1616844257280
• Sum of proper divisors (its aliquot sum) s(n): 977898340902
• 638945916378 is an abundant number, because the sum of its proper divisors (977898340902) is greater than itself. Its abundance is 338952424524

Bases of 638945916378

• Binary: 1001010011000100001001001111010111011010₂
• Hexadecimal: 0x94C424F5DA
• Base-36: 85IZWGD6

Squares and roots of 638945916378

• 638945916378 squared (638945916378²) is 408251884056122168638884
• 638945916378 cubed (638945916378³) is 260850874171283986622092390343242152
• The square root of 638945916378 is 799340.9262498699
• The cube root of 638945916378 is 8613.0050054991

Scales and comparisons

• 638,945,916,378 seconds is equal to 20,316 years, 26 weeks, 1 day, 8 hours, 46 minutes, 18 seconds.
• To count from 1 to 638,945,916,378 would take you about forty thousand, six hundred thirty-three 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 638945916378 cubic inches would be around 717.8 feet tall.

Recreational maths with 638945916378

• 638945916378 backwards is 873619549836
• The number of decimal digits it has is: 12
• The sum of 638945916378's digits is 69
• More coming soon!