81390471873815832

Names of 81390471873815832

• Cardinal: 81390471873815832 can be written as Eighty-one quadrillion, three hundred ninety trillion, four hundred seventy-one billion, eight hundred seventy-three million, eight hundred fifteen thousand, eight hundred thirty-two.

Scientific notation

• Scientific notation: 8.1390471873815832 × 10¹⁶

Factors of 81390471873815832

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 781242

Divisors of 81390471873815832

• Number of divisors d(n): 256
• Complete list of divisors:
  1 2 3 4 6 7 8 12 13 14 21 24 26 28 39 42 52 56 78 84 91 104 156 168 182 273 312 364 546 571 728 1092 1142 1713 2184 2284 3426 3997 4568 6852 7423 7994 11991 13704 14846 15988 22269 23982 29692 31976 44538 47964 51961 59384 89076 95219 95928 103922 155883 178152 190438 207844 285657 311766 380876 415688 571314 623532 666533 685427 761752 1142628 1237847 1247064 1333066 1370854 1999599 2056281 2285256 2475694 2666132 2741708 3713541 3999198 4112562 4797989 4951388 5332264 5483416 7427082 7998396 8225124 8664929 8910551 9595978 9902776 14393967 14854164 15996792 16450248 17329858 17821102 19191956 25994787 26731653 28787934 29708328 34659716 35642204 38383912 51989574 53463306 54370049 57575868 62373857 69319432 71284408 103979148 106926612 108740098 115151736 124747714 163110147 187121571 207958296 213853224 217480196 249495428 326220294 374243142 380590343 391378817 434960392 498990856 652440588 706810637 748486284 761180686 782757634 1141771029 1174136451 1304881176 1413621274 1496972568 1522361372 1565515268 2120431911 2283542058 2348272902 2739651719 2827242548 3044722744 3131030536 4240863822 4567084116 4696545804 4947674459 5087924621 5479303438 5654485096 8218955157 8481727644 9134168232 9393091608 9895348918 10175849242 10958606876 14843023377 15263773863 16437910314 16963455288 19790697836 20351698484 21917213752 29686046754 30527547726 32875820628 35615472347 39581395672 40703396968 59372093508 61055095452 65265673513 65751641256 71230944694 106846417041 118744187016 122110190904 130531347026 142461889388 195797020539 213692834082 261062694052 284923778776 391594041078 427385668164 456859714591 522125388104 783188082156 848453755669 854771336328 913719429182 1370579143773 1566376164312 1696907511338 1827438858364 2545361267007 2741158287546 3393815022676 3654877716728 5090722534014 5482316575092 5939176289683 6787630045352 10181445068028 10964633150184 11878352579366 17817528869049 20362890136056 23756705158732 35635057738098 37266699575923 47513410317464 71270115476196 74533399151846 111800098727769 142540230952392 149066798303692 223600197455538 260866897031461 298133596607384 447200394911076 484467094486999 521733794062922 782600691094383 894400789822152 968934188973998 1043467588125844 1453401283460997 1565201382188766 1937868377947996 2086935176251688 2906802566921994 3130402764377532 3391269661408993 3875736755895992 5813605133843988 6260805528755064 6782539322817986 10173808984226979 11627210267687976 13565078645635972 20347617968453958 27130157291271944 40695235936907916 81390471873815832
• Sum of all divisors σ(n): 250873807158374400
• Sum of proper divisors (its aliquot sum) s(n): 169483335284558568
• 81390471873815832 is an abundant number, because the sum of its proper divisors (169483335284558568) is greater than itself. Its abundance is 88092863410742736

Bases of 81390471873815832

• Binary: 100100001001010000011001111110100001000111110010100011000₂
• Hexadecimal: 0x1212833F423E518
• Base-36: M9EIILLYKGO

Squares and roots of 81390471873815832

• 81390471873815832 squared (81390471873815832²) is 6624408911842406031027852253852224
• 81390471873815832 cubed (81390471873815832³) is 539163767219964289448384187943864608130460319610368
• The square root of 81390471873815832 is 285290153.8325776711
• The cube root of 81390471873815832 is 433369.0135375937

Scales and comparisons

• 81,390,471,873,815,832 seconds is equal to 2,587,965,248 years, 17 weeks, 9 hours, 17 minutes, 12 seconds.
• To count from 1 to 81,390,471,873,815,832 would take you about seven billion, seven hundred sixty-three million, eight hundred ninety-five thousand, seven hundred forty-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 81390471873815832 cubic inches would be around 36114.1 feet tall.

Recreational maths with 81390471873815832

• 81390471873815832 backwards is 23851837817409318
• 81390471873815832 is a Harshad number.
• The number of decimal digits it has is: 17
• The sum of 81390471873815832's digits is 78
• More coming soon!