640842664

Names of 640842664

• Cardinal: 640842664 can be written as Six hundred forty million, eight hundred forty-two thousand, six hundred sixty-four.

Scientific notation

• Scientific notation: 6.40842664 × 10⁸

Factors of 640842664

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 995

Divisors of 640842664

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 4 7 8 11 14 22 28 31 37 44 56 62 74 77 88 124 148 154 217 248 259 296 308 341 407 434 518 616 682 814 868 907 1036 1147 1364 1628 1736 1814 2072 2294 2387 2728 2849 3256 3628 4588 4774 5698 6349 7256 8029 9176 9548 9977 11396 12617 12698 16058 19096 19954 22792 25234 25396 28117 32116 33559 39908 50468 50792 56234 64232 67118 69839 79816 88319 100936 112468 134236 139678 176638 196819 224936 234913 268472 279356 309287 353276 369149 393638 469826 558712 618574 706552 738298 787276 939652 1040329 1237148 1476596 1574552 1879304 2080658 2165009 2474296 2584043 2953192 4161316 4330018 5168086 7282303 8322632 8660036 10336172 11443619 14564606 17320072 20672344 22887238 29129212 45774476 58258424 80105333 91548952 160210666 320421332 640842664
• Sum of all divisors σ(n): 1589944320
• Sum of proper divisors (its aliquot sum) s(n): 949101656
• 640842664 is an abundant number, because the sum of its proper divisors (949101656) is greater than itself. Its abundance is 308258992

Bases of 640842664

• Binary: 100110001100100111101110101000₂
• Hexadecimal: 0x26327BA8
• Base-36: ALJHD4

Squares and roots of 640842664

• 640842664 squared (640842664²) is 410679320002616896
• 640842664 cubed (640842664³) is 263180829480185498604050944
• The square root of 640842664 is 25314.8704124671
• The cube root of 640842664 is 862.1519319191

Scales and comparisons

• 640,842,664 seconds is equal to 20 years, 19 weeks, 4 days, 3 hours, 51 minutes, 4 seconds.
• To count from 1 to 640,842,664 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 640842664 cubic inches would be around 71.8 feet tall.

Recreational maths with 640842664

• 640842664 backwards is 466248046
• The number of decimal digits it has is: 9
• The sum of 640842664's digits is 40
• More coming soon!