81389759472

Names of 81389759472

• Cardinal: 81389759472 can be written as Eighty-one billion, three hundred eighty-nine million, seven hundred fifty-nine thousand, four hundred seventy-two.

Scientific notation

• Scientific notation: 8.1389759472 × 10¹⁰

Factors of 81389759472

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 478

Divisors of 81389759472

• Number of divisors d(n): 640
• Complete list of divisors:
  1 2 3 4 6 7 8 9 12 14 16 18 21 24 27 28 31 36 42 43 48 54 56 61 62 63 72 84 86 93 108 112 122 124 126 129 144 168 172 183 186 189 216 217 244 248 252 258 279 301 331 336 344 366 372 378 387 427 432 434 488 496 504 516 549 558 602 651 662 688 732 744 756 774 837 854 868 903 976 993 1008 1032 1098 1116 1161 1204 1281 1302 1324 1333 1464 1488 1512 1548 1647 1674 1708 1736 1806 1891 1953 1986 2064 2196 2232 2317 2322 2408 2562 2604 2623 2648 2666 2709 2928 2979 3024 3096 3294 3348 3416 3472 3612 3782 3843 3906 3972 3999 4392 4464 4634 4644 4816 5124 5208 5246 5296 5332 5418 5673 5859 5958 6192 6588 6696 6832 6951 7224 7564 7686 7812 7869 7944 7998 8127 8784 8937 9268 9288 9331 10248 10261 10416 10492 10664 10836 11346 11529 11718 11916 11997 13176 13237 13392 13902 14233 14448 15128 15372 15624 15738 15888 15996 16254 17019 17874 18361 18536 18576 18662 20191 20496 20522 20853 20984 21328 21672 22692 23058 23436 23607 23832 23994 26352 26474 27804 27993 28466 30256 30744 30783 31248 31476 31992 32508 34038 35748 35991 36722 37072 37324 39711 40382 41044 41706 41968 42699 43344 45384 46116 46872 47214 47664 47988 51057 52948 55083 55608 55986 56932 60573 61488 61566 62559 62952 63984 65016 68076 70821 71496 71827 71982 73444 74648 79422 80764 81313 82088 83412 83979 85398 90768 92232 92349 93744 94428 95976 99631 102114 105896 110166 111216 111972 113864 119133 121146 123132 125118 125904 128097 130032 136152 141337 141642 142992 143654 143964 146888 149296 158844 161528 162626 164176 165249 166824 167958 170796 181719 184464 184698 188856 191952 199262 204228 211792 215481 220332 223944 227728 238266 242292 243939 246264 250236 251937 256194 272304 277047 282674 283284 287308 287928 293776 298893 317688 323056 325252 330498 333648 335916 341592 357399 363438 369396 377712 384291 398524 408456 424011 430962 440664 441223 447888 476532 484584 487878 492528 495747 500472 503874 512388 545157 554094 565348 566568 569191 574616 575856 597786 625921 635376 646443 650504 660996 671832 683184 714798 726876 731817 738792 768582 797048 816912 848022 861924 868213 881328 882446 896679 953064 969168 975756 991494 1000944 1007748 1024776 1090314 1108188 1130696 1133136 1138382 1149232 1195572 1251842 1272033 1292886 1301008 1321992 1323669 1343664 1429596 1453752 1463634 1477584 1537164 1594096 1696044 1707573 1723848 1736426 1764892 1793358 1877763 1906128 1939329 1951512 1982988 2015496 2049552 2180628 2195451 2216376 2261392 2276764 2391144 2503684 2544066 2585772 2604639 2643984 2647338 2690037 2859192 2907504 2927268 3074328 3088561 3392088 3415146 3447696 3472852 3529784 3586716 3755526 3816099 3878658 3903024 3965976 3971007 4030992 4361256 4381447 4390902 4432752 4553528 4782288 5007368 5088132 5122719 5171544 5209278 5294676 5380074 5633289 5718384 5854536 6077491 6148656 6177122 6784176 6830292 6945704 7059568 7173432 7511052 7632198 7757316 7813917 7931952 7942014 8722512 8762894 8781804 9107056 9265683 10014736 10176264 10245438 10343088 10418556 10589352 10760148 11266578 11709072 11913021 12154982 12354244 13144341 13660584 13891408 14346864 15022104 15264396 15368157 15514632 15627834 15884028 16899867 17525788 17563608 18232473 18531366 20352528 20490876 20837112 21178704 21520296 22533156 23441751 23826042 24309964 24708488 26288682 26914603 27321168 27797049 30044208 30528792 30736314 31029264 31255668 31768056 33799734 35051576 35127216 36464946 37062732 39433023 40981752 41674224 43040592 45066312 46883502 47652084 48619928 49416976 52577364 53829206 54697419 55594098 61057584 61472628 62511336 63536112 67599468 70103152 72929892 74125464 78866046 80743809 81963504 83391147 90132624 93767004 95304168 97239856 105154728 107658412 109394838 111188196 118299069 122945256 125022672 135198936 145859784 148250928 157732092 161487618 164092257 166782294 187534008 188402221 190608336 210309456 215316824 218789676 222376392 236598138 242231427 245890512 270397872 291719568 315464184 322975236 328184514 333564588 375068016 376804442 430633648 437579352 444752784 473196276 484462854 565206663 630928368 645950472 656369028 667129176 726694281 753608884 875158704 946392552 968925708 1130413326 1291900944 1312738056 1334258352 1453388562 1507217768 1695619989 1892785104 1937851416 2260826652 2625476112 2906777124 3014435536 3391239978 3875702832 4521653304 5086859967 5813554248 6782479956 9043306608 10173719934 11627108496 13564959912 20347439868 27129919824 40694879736 81389759472
• Sum of all divisors σ(n): 287504138240
• Sum of proper divisors (its aliquot sum) s(n): 206114378768
• 81389759472 is an abundant number, because the sum of its proper divisors (206114378768) is greater than itself. Its abundance is 124724619296

Bases of 81389759472

• Binary: 1001011110011001101010010101111110000₂
• Hexadecimal: 0x12F3352BF0
• Base-36: 11E1D0C0

Squares and roots of 81389759472

• 81389759472 squared (81389759472²) is 6624292946910013718784
• 81389759472 cubed (81389759472³) is 539149609621072082200050008322048
• The square root of 81389759472 is 285288.9052732335
• The cube root of 81389759472 is 4333.6774912353

Scales and comparisons

• 81,389,759,472 seconds is equal to 2,587 years, 49 weeks, 2 hours, 31 minutes, 12 seconds.
• To count from 1 to 81,389,759,472 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 81389759472 cubic inches would be around 361.1 feet tall.

Recreational maths with 81389759472

• 81389759472 backwards is 27495798318
• 81389759472 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81389759472's digits is 63
• More coming soon!