81386382420

Names of 81386382420

• Cardinal: 81386382420 can be written as Eighty-one billion, three hundred eighty-six million, three hundred eighty-two thousand, four hundred twenty.

Scientific notation

• Scientific notation: 8.138638242 × 10¹⁰

Factors of 81386382420

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 430

Divisors of 81386382420

• Number of divisors d(n): 864
• Complete list of divisors:
  1 2 3 4 5 6 7 9 10 12 14 15 17 18 20 21 27 28 29 30 34 35 36 42 45 49 51 54 58 60 63 68 70 84 85 87 90 98 102 105 108 116 119 126 135 140 145 147 153 170 174 180 189 196 203 204 210 238 245 252 255 261 270 289 290 294 306 315 340 348 357 367 378 406 420 435 441 459 476 490 493 510 522 540 578 580 588 595 609 612 630 714 734 735 756 765 783 812 833 867 870 882 918 945 980 986 1015 1020 1044 1071 1101 1156 1190 1218 1260 1305 1323 1421 1428 1445 1468 1470 1479 1530 1566 1666 1734 1740 1764 1785 1827 1835 1836 1890 1972 2023 2030 2142 2202 2205 2295 2380 2436 2465 2499 2569 2601 2610 2646 2842 2890 2940 2958 3045 3060 3132 3213 3303 3332 3451 3468 3570 3654 3670 3780 3915 4046 4060 4165 4263 4284 4335 4404 4410 4437 4590 4930 4998 5138 5202 5220 5292 5355 5481 5505 5684 5780 5916 6069 6090 6239 6426 6606 6615 6902 7105 7140 7308 7340 7395 7497 7707 7803 7830 8092 8330 8381 8526 8670 8820 8874 9135 9180 9860 9909 9996 10115 10276 10353 10404 10643 10710 10962 11010 12138 12180 12478 12495 12789 12845 12852 13005 13212 13230 13311 13804 14161 14210 14790 14994 15414 15606 15660 16065 16515 16660 16762 17052 17255 17340 17748 17983 18207 18270 18717 19818 20230 20706 21286 21315 21420 21924 22020 22185 22491 23121 24157 24276 24956 24990 25143 25578 25690 26010 26460 26622 27405 28322 28420 29580 29988 30345 30828 31059 31195 31212 31929 32130 33030 33524 34510 35966 36414 36540 37434 37485 38367 38535 39015 39636 40460 41412 41905 42483 42572 42630 43673 44370 44982 46242 48314 49545 49980 50286 51156 51380 51765 52020 53215 53244 53949 54621 54810 56151 56644 58667 60690 62118 62390 63858 63945 64260 66060 66555 69020 69363 70805 71932 72471 72828 74501 74868 74970 75429 76734 77070 78030 83810 84966 85260 87346 88740 89915 89964 91035 92484 93177 93585 95787 96628 99090 100572 103530 106063 106430 107898 109242 109620 112302 112455 115605 117334 120785 121380 124236 124780 125715 127449 127716 127890 131019 133110 138726 141610 144942 149002 149940 150858 153468 154140 155295 156060 159645 161847 167620 168453 169932 174692 176001 179830 180931 182070 186354 187170 191574 191835 198180 207060 212126 212415 212860 215796 217413 218365 218484 223503 224604 224910 226287 231210 234668 241570 251430 254898 255780 262038 266220 269745 273105 277452 280755 283220 287361 289884 293335 298004 301716 305711 310590 318189 319290 323694 336906 346815 352002 359660 361862 362355 364140 372505 372708 374340 377145 382347 383148 383670 393057 410669 424252 424830 434826 436730 447006 449820 452574 462420 465885 478935 483140 485541 502860 509796 521507 524076 528003 530315 539490 542793 546210 561510 574722 586670 611422 621180 636378 637245 638580 647388 652239 655095 670509 673812 693630 704004 723724 724710 742441 745010 754290 764694 767340 786114 809235 821338 842265 849660 869652 873460 880005 894012 904655 905148 917133 931770 954567 957870 971082 1043014 1056006 1060630 1078980 1085586 1087065 1092420 1117515 1123020 1131435 1149444 1173340 1179171 1222844 1232007 1266517 1272756 1274490 1304478 1310190 1341018 1387260 1436805 1449420 1484882 1490020 1508580 1528555 1529388 1564521 1572228 1584009 1590945 1618470 1628379 1642676 1684530 1760010 1809310 1834266 1863540 1909134 1911735 1915740 1942164 1965285 2011527 2053345 2086028 2112012 2121260 2171172 2174130 2227323 2235030 2262870 2358342 2427705 2464014 2533034 2548980 2607535 2608956 2620380 2640015 2682036 2713965 2751399 2863701 2873610 2969764 3057110 3075827 3129042 3168018 3181890 3236940 3256758 3261195 3352545 3369060 3520020 3618620 3668532 3696021 3712205 3799551 3818268 3823470 3930570 4023054 4106690 4348260 4454646 4470060 4525740 4585665 4693563 4716684 4772835 4855410 4885137 4928028 5066068 5197087 5215070 5280030 5427930 5502798 5727402 5747220 5895855 6114220 6151654 6160035 6258084 6332585 6336036 6363780 6513516 6522390 6681969 6705090 7392042 7424410 7599102 7646940 7822605 7861140 7920045 8046108 8141895 8213380 8254197 8865619 8909292 9171330 9227481 9387126 9545670 9710820 9770274 10057635 10394174 10430140 10560060 10855860 11005596 11088063 11136615 11398653 11454804 11791710 12303308 12320070 12665170 13044780 13363938 13410180 13756995 14080689 14318505 14784084 14848820 15198204 15379135 15591261 15645210 15840090 16283790 16508394 17731238 18342660 18454962 18480105 18774252 18997755 19091340 19540548 20045907 20115270 20788348 21530789 22176126 22273230 22797306 23467815 23583420 24425685 24640140 25330340 25985435 26596857 26727876 27513990 27682443 28161378 28637010 30758270 31182522 31290420 31680180 32567580 33016788 33409845 34195959 35462476 36909924 36960210 37995510 40091814 40230540 41270985 43061578 44328095 44352252 44546460 45594612 46137405 46773783 46935630 48851370 51970870 53193714 55027980 55364886 55440315 56322756 56993265 57274020 61516540 62365044 64592367 66819690 68391918 70403445 73920420 75991020 77956305 79790571 80183628 82541970 83047329 86123156 88656190 92274810 93547566 93871260 97702740 100229535 103941740 106387428 107653945 110729772 110880630 113986530 129184734 132984285 133639380 136783836 138412215 140321349 140806890 150715523 155912610 159581142 165083940 166094658 170979795 177312380 184549620 187095132 193777101 200459070 215307890 221761260 227973060 233868915 239371713 258369468 265968570 276824430 280642698 281613780 301431046 311825220 319162284 322961835 332189316 341959590 387554202 398952855 400918140 415236645 430615780 452146569 467737830 478743426 531937140 553648860 561285396 581331303 602862092 645923670 683919180 701606745 753577615 775108404 797905710 830473290 904293138 935475660 957486852 968885505 1162662606 1196858565 1291847340 1356439707 1403213490 1507155230 1595811420 1660946580 1808586276 1937771010 2260732845 2325325212 2393717130 2712879414 2806426980 2906656515 3014310460 3875542020 4069319121 4521465690 4787434260 5425758828 5813313030 6782198535 8138638242 9042931380 11626626060 13564397070 16277276484 20346595605 27128794140 40693191210 81386382420
• Sum of all divisors σ(n): 324557452800
• Sum of proper divisors (its aliquot sum) s(n): 243171070380
• 81386382420 is an abundant number, because the sum of its proper divisors (243171070380) is greater than itself. Its abundance is 161784687960

Bases of 81386382420

• Binary: 1001011110011000000011010010001010100₂
• Hexadecimal: 0x12F301A454
• Base-36: 11DZCML0

Squares and roots of 81386382420

• 81386382420 squared (81386382420²) is 6623743243414485056400
• 81386382420 cubed (81386382420³) is 539082500660422427367545668488000
• The square root of 81386382420 is 285282.9865589605
• The cube root of 81386382420 is 4333.6175522587

Scales and comparisons

• 81,386,382,420 seconds is equal to 2,587 years, 43 weeks, 3 days, 27 minutes.
• To count from 1 to 81,386,382,420 would take you about five thousand, one hundred seventy-five 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 81386382420 cubic inches would be around 361.1 feet tall.

Recreational maths with 81386382420

• 81386382420 backwards is 02428368318
• 81386382420 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81386382420's digits is 45
• More coming soon!