81721131492

Names of 81721131492

• Cardinal: 81721131492 can be written as Eighty-one billion, seven hundred twenty-one million, one hundred thirty-one thousand, four hundred ninety-two.

Scientific notation

• Scientific notation: 8.1721131492 × 10¹⁰

Factors of 81721131492

• Number of distinct prime factors ω(n): 8
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 419

Divisors of 81721131492

• Number of divisors d(n): 576
• Complete list of divisors:
  1 2 3 4 6 7 11 12 13 14 21 22 26 28 31 33 39 42 44 52 62 66 71 77 78 84 91 93 121 124 132 142 143 154 156 182 186 213 217 231 242 273 281 284 286 308 341 363 364 372 403 426 429 434 462 484 497 546 562 572 651 682 726 781 806 843 847 852 858 868 923 924 994 1001 1023 1092 1124 1209 1302 1364 1452 1491 1562 1573 1612 1686 1694 1716 1846 1967 1988 2002 2046 2201 2343 2387 2418 2541 2604 2769 2821 2982 3003 3091 3124 3146 3372 3388 3653 3692 3751 3934 4004 4092 4402 4433 4686 4719 4774 4836 5082 5467 5538 5642 5901 5964 6006 6182 6292 6461 6603 7161 7306 7502 7868 8463 8591 8711 8804 8866 9273 9372 9438 9548 10153 10164 10934 10959 11011 11076 11253 11284 11802 12012 12364 12922 13206 13299 14322 14612 15004 15407 16401 16926 17182 17422 17732 18546 18876 19383 19951 20306 21637 21868 21918 22022 22506 23604 24211 25571 25773 25844 26133 26257 26412 26598 28613 28644 30459 30814 31031 32802 33033 33852 34001 34364 34844 37092 38766 39902 40183 40612 43274 43836 44044 45012 46221 48422 48763 51142 51546 52266 52514 53196 57226 59853 60137 60918 60977 61628 62062 64911 65604 66066 68002 71071 72633 76713 77532 78771 79804 80366 85839 86548 92442 93093 95821 96844 97526 102003 102284 103092 104532 105028 111683 113243 114452 119706 120274 120549 121836 121954 124124 129822 132132 136004 139657 142142 145266 146289 153426 157542 160732 169477 171678 180411 182931 184884 186186 191642 195052 200291 204006 213213 219461 223366 226486 238007 239412 240548 241098 243908 259363 259644 266321 279314 281281 284284 287463 290532 292578 306852 314743 315084 335049 338954 339729 341341 343356 360822 365862 372372 383284 400582 408012 418971 426426 438922 442013 446732 452972 476014 482196 508431 518726 532642 558628 562562 574926 585156 600873 618481 629486 658383 670098 670747 677908 679458 682682 714021 721644 731724 778089 781781 792701 798963 801164 837942 843843 852852 877844 884026 944229 952028 1016862 1024023 1037452 1054031 1065284 1125124 1149852 1201746 1236962 1245673 1258972 1316766 1326039 1340196 1341494 1358916 1365364 1428042 1536227 1556178 1563562 1585402 1597926 1675884 1687686 1768052 1815541 1855443 1864247 1888458 2012241 2033724 2048046 2108062 2203201 2345343 2378103 2403492 2414071 2473924 2491346 2633532 2652078 2682988 2852993 2856084 3072454 3094091 3112356 3127124 3162093 3170804 3195852 3375372 3462173 3631082 3710886 3728494 3737019 3776916 4024482 4096092 4216124 4329367 4406402 4608681 4690686 4756206 4828142 4982692 5304156 5446623 5592741 5705986 6144908 6188182 6324186 6609603 6803291 6924346 7242213 7262164 7378217 7421772 7456988 7474038 8040253 8048964 8558979 8658734 8719711 8812804 9217362 9282273 9381372 9512412 9656284 10386519 10893246 11185482 11411972 12376364 12648372 12988101 13219206 13606582 13702403 13848692 14484426 14756434 14948076 16080506 16898497 17117958 17317468 17439422 18434724 18564546 19970951 20409873 20773038 21786492 22134651 22370964 24120759 24235211 25976202 26159133 26438412 27213164 27404806 28968852 29512868 31382923 32161012 33796994 34235916 34878844 37129092 39941902 40819746 41107209 41546076 44269302 47623037 48241518 48470422 50695491 51952404 52318266 54809612 56281771 59912853 62765846 67593988 72705633 74836201 79883804 81639492 82214418 88442783 88538604 94148769 95246074 95916821 96483036 96940844 101390982 104636532 112563542 119825706 125531692 142869111 145411266 149672402 164428836 168845313 176885566 188297538 190492148 191833642 202781964 219680461 224508603 225127084 239651412 265328349 285738222 287750463 290822532 299344804 337690626 353771132 376595076 383667284 439360922 449017206 523853407 530656698 571476444 575500926 619099481 659041383 675381252 878721844 898034412 972870613 1047706814 1061313396 1151001852 1238198962 1318082766 1571560221 1857298443 1945741226 2095413628 2476397924 2636165532 2918611839 3143120442 3714596886 3891482452 5837223678 6286240884 6810094291 7429193772 11674447356 13620188582 20430282873 27240377164 40860565746 81721131492
• Sum of all divisors σ(n): 270993752064
• Sum of proper divisors (its aliquot sum) s(n): 189272620572
• 81721131492 is an abundant number, because the sum of its proper divisors (189272620572) is greater than itself. Its abundance is 107551489080

Bases of 81721131492

• Binary: 1001100000110111101011000000111100100₂
• Hexadecimal: 0x1306F581E4
• Base-36: 11JINGMC

Squares and roots of 81721131492

• 81721131492 squared (81721131492²) is 6678343332332754146064
• 81721131492 cubed (81721131492³) is 545761773610286456669004318247488
• The square root of 81721131492 is 285869.0810353579
• The cube root of 81721131492 is 4339.5509366399

Scales and comparisons

• 81,721,131,492 seconds is equal to 2,598 years, 24 weeks, 6 days, 10 hours, 18 minutes, 12 seconds.
• To count from 1 to 81,721,131,492 would take you about five thousand, one hundred ninety-six 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 81721131492 cubic inches would be around 361.6 feet tall.

Recreational maths with 81721131492

• 81721131492 backwards is 29413112718
• 81721131492 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81721131492's digits is 39
• More coming soon!