81213588820

Names of 81213588820

• Cardinal: 81213588820 can be written as Eighty-one billion, two hundred thirteen million, five hundred eighty-eight thousand, eight hundred twenty.

Scientific notation

• Scientific notation: 8.121358882 × 10¹⁰

Factors of 81213588820

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 550

Divisors of 81213588820

• Number of divisors d(n): 432
• Complete list of divisors:
  1 2 4 5 7 10 13 14 20 26 28 29 35 37 49 52 58 65 70 74 91 98 116 130 140 145 148 169 182 185 196 203 245 259 260 290 338 364 370 377 406 455 457 481 490 518 580 637 676 740 754 812 845 910 914 962 980 1015 1036 1073 1183 1274 1295 1421 1508 1690 1813 1820 1828 1885 1924 2030 2146 2285 2366 2405 2548 2590 2639 2842 3185 3199 3367 3380 3626 3770 4060 4292 4570 4732 4810 4901 5180 5278 5365 5684 5915 5941 6253 6370 6398 6734 7105 7252 7511 7540 8281 9065 9140 9620 9802 10556 10730 11830 11882 12506 12740 12796 13195 13253 13468 13949 14210 15022 15995 16562 16835 16909 18130 18473 19604 21460 22393 23569 23660 23764 24505 25012 26390 26506 27898 28420 29705 30044 31265 31990 33124 33670 33818 34307 36260 36946 37555 41405 41587 43771 44786 47138 49010 52577 52780 53012 55796 59410 62530 63980 66265 67340 67636 68614 69745 73892 75110 77233 82810 83174 84545 87542 89572 92365 92771 94276 97643 98020 105154 111965 117845 118363 118820 125060 132530 137228 139490 150220 154466 165620 166348 169090 171535 172289 175084 181337 184730 185542 195286 207935 210308 218855 219817 223930 235690 236726 240149 262885 265060 278980 291109 306397 308932 338180 343070 344578 362674 369460 371084 386165 390572 415870 437710 439634 447860 463855 471380 473452 480298 488215 490361 525770 540631 582218 591815 612794 649397 683501 686140 689156 725348 772330 828541 831740 861445 875420 879268 906685 927710 960596 976430 980722 1051540 1081262 1099085 1164436 1183630 1200745 1206023 1225588 1269359 1298794 1367002 1455545 1531985 1538719 1544660 1657082 1722890 1813370 1855420 1952860 1961444 2162524 2198170 2239757 2367260 2401490 2412046 2451805 2538718 2597588 2703155 2734004 2857621 2911090 3063970 3077438 3246985 3314164 3417505 3432527 3445780 3626740 3784417 4142705 4396340 4479514 4802980 4824092 4903610 5077436 5406310 5715242 5822180 6030115 6127940 6154876 6346795 6374693 6493970 6835010 6865054 7568834 7693595 8285410 8442161 8885513 8959028 9807220 10771033 10812620 11198785 11430484 12060230 12693590 12749386 12987940 13670020 13730108 14288105 15137668 15387190 15678299 16570820 16884322 17162635 17771026 18922085 20003347 21542066 22397570 24027689 24120460 25387180 25498772 28576210 30774380 31356598 31873465 33768644 34325270 35542052 37844170 40006694 42210805 43084132 44427565 44622851 44795140 48055378 53855165 57152420 62713196 63746930 68650540 75688340 78391495 80013388 82871009 84421610 88855130 89245702 96110756 100016735 107710330 109748093 120138445 127493860 140023429 156782990 165742018 168843220 177710260 178491404 200033470 215420660 219496186 223114255 240276890 280046858 312359957 313565980 331484036 400066940 414355045 438992372 446228510 480553780 548740465 560093716 580097063 624719914 700117145 828710090 892457020 1097480930 1160194126 1249439828 1400234290 1561799785 1657420180 2194961860 2320388252 2800468580 2900485315 3123599570 4060679441 5800970630 6247199140 8121358882 11601941260 16242717764 20303397205 40606794410 81213588820
• Sum of all divisors σ(n): 228741816240
• Sum of proper divisors (its aliquot sum) s(n): 147528227420
• 81213588820 is an abundant number, because the sum of its proper divisors (147528227420) is greater than itself. Its abundance is 66314638600

Bases of 81213588820

• Binary: 1001011101000101101010000010101010100₂
• Hexadecimal: 0x12E8B50554
• Base-36: 11B4H26S

Squares and roots of 81213588820

• 81213588820 squared (81213588820²) is 6595647009024028992400
• 81213588820 cubed (81213588820³) is 535656164192740320088532504968000
• The square root of 81213588820 is 284979.9796827841
• The cube root of 81213588820 is 4330.5484395107

Scales and comparisons

• 81,213,588,820 seconds is equal to 2,582 years, 17 weeks, 5 days, 2 hours, 13 minutes, 40 seconds.
• To count from 1 to 81,213,588,820 would take you about five thousand, one hundred sixty-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 81213588820 cubic inches would be around 360.9 feet tall.

Recreational maths with 81213588820

• 81213588820 backwards is 02888531218
• The number of decimal digits it has is: 11
• The sum of 81213588820's digits is 46
• More coming soon!