640339986

Names of 640339986

• Cardinal: 640339986 can be written as Six hundred forty million, three hundred thirty-nine thousand, nine hundred eighty-six.

Scientific notation

• Scientific notation: 6.40339986 × 10⁸

Factors of 640339986

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 353

Divisors of 640339986

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 6 11 13 17 22 26 33 34 39 51 66 78 102 121 143 169 187 221 242 286 307 338 363 374 429 442 507 561 614 663 726 858 921 1014 1122 1326 1573 1842 1859 2057 2431 2873 3146 3377 3718 3991 4114 4719 4862 5219 5577 5746 6171 6754 7293 7982 8619 9438 10131 10438 11154 11973 12342 14586 15657 17238 20262 20449 23946 26741 31314 31603 37147 40898 43901 51883 53482 57409 61347 63206 67847 74294 80223 87802 94809 103766 111441 114818 122694 131703 135694 155649 160446 172227 189618 203541 222882 263406 311298 344454 347633 407082 482911 570713 631499 695266 746317 882011 965822 1042899 1141426 1262998 1448733 1492634 1712139 1764022 1894497 2085798 2238951 2646033 2897466 3424278 3788994 4477902 5292066 6277843 8209487 9702121 12555686 16418974 18833529 19404242 24628461 29106363 37667058 49256922 58212726 106723331 213446662 320169993 640339986
• Sum of all divisors σ(n): 1619224992
• Sum of proper divisors (its aliquot sum) s(n): 978885006
• 640339986 is an abundant number, because the sum of its proper divisors (978885006) is greater than itself. Its abundance is 338545020

Bases of 640339986

• Binary: 100110001010101101000000010010₂
• Hexadecimal: 0x262AD012
• Base-36: AL8PHU

Squares and roots of 640339986

• 640339986 squared (640339986²) is 410035297670480196
• 640339986 cubed (640339986³) is 262561996769821121319917256
• The square root of 640339986 is 25304.9399525073
• The cube root of 640339986 is 861.9264485057

Scales and comparisons

• 640,339,986 seconds is equal to 20 years, 18 weeks, 5 days, 8 hours, 13 minutes, 6 seconds.
• To count from 1 to 640,339,986 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 640339986 cubic inches would be around 71.8 feet tall.

Recreational maths with 640339986

• 640339986 backwards is 689933046
• The number of decimal digits it has is: 9
• The sum of 640339986's digits is 48
• More coming soon!