81971738208

Names of 81971738208

• Cardinal: 81971738208 can be written as Eighty-one billion, nine hundred seventy-one million, seven hundred thirty-eight thousand, two hundred eight.

Scientific notation

• Scientific notation: 8.1971738208 × 10¹⁰

Factors of 81971738208

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 7032

Divisors of 81971738208

• Number of divisors d(n): 288
• Complete list of divisors:
  1 2 3 4 6 8 9 12 16 18 24 27 32 36 37 41 48 54 72 74 81 82 96 108 111 123 144 148 162 164 216 222 243 246 288 296 324 328 333 369 432 444 486 492 592 648 656 666 738 864 888 972 984 999 1107 1184 1296 1312 1332 1476 1517 1776 1944 1968 1998 2214 2592 2664 2952 2997 3034 3321 3552 3888 3936 3996 4428 4551 5328 5904 5994 6068 6642 6949 7776 7992 8856 8991 9102 9963 10656 11808 11988 12136 13284 13653 13898 15984 17712 17982 18204 19926 20847 23976 24272 26568 27306 27796 31968 35424 35964 36408 39852 40959 41694 47952 48544 53136 54612 55592 62541 71928 72816 79704 81918 83388 95904 106272 109224 111184 122877 125082 143856 145632 159408 163836 166776 187623 218448 222368 245754 250164 257113 284909 287712 318816 327672 333552 368631 375246 436896 491508 500328 514226 562869 569818 655344 667104 737262 750492 771339 854727 983016 1000656 1028452 1125738 1139636 1310688 1474524 1500984 1542678 1688607 1709454 1966032 2001312 2056904 2251476 2279272 2314017 2564181 2949048 3001968 3085356 3377214 3418908 3932064 4113808 4502952 4558544 4628034 5128362 5898096 6003936 6170712 6754428 6837816 6942051 7692543 8227616 9005904 9117088 9256068 10256724 10541633 11796192 12341424 13508856 13675632 13884102 15385086 18011808 18512136 20513448 20826153 21083266 23077629 24682848 27017712 27351264 27768204 30770172 31624899 37024272 41026896 41652306 42166532 46155258 54035424 55536408 61540344 62478459 63249798 69232887 74048544 82053792 83304612 84333064 92310516 94874697 111072816 123080688 124956918 126499596 138465774 166609224 168666128 184621032 189749394 222145632 246161376 249913836 252999192 276931548 284624091 333218448 337332256 369242064 379498788 499827672 505998384 553863096 569248182 666436896 738484128 758997576 853872273 999655344 1011996768 1107726192 1138496364 1517995152 1707744546 1999310688 2215452384 2276992728 2561616819 3035990304 3415489092 4553985456 5123233638 6830978184 9107970912 10246467276 13661956368 20492934552 27323912736 40985869104 81971738208
• Sum of all divisors σ(n): 254366330400
• Sum of proper divisors (its aliquot sum) s(n): 172394592192
• 81971738208 is an abundant number, because the sum of its proper divisors (172394592192) is greater than itself. Its abundance is 90422853984

Bases of 81971738208

• Binary: 1001100010101111001010111011001100000₂
• Hexadecimal: 0x1315E57660
• Base-36: 11NNUU00

Squares and roots of 81971738208

• 81971738208 squared (81971738208²) is 6719365864840887051264
• 81971738208 cubed (81971738208³) is 550798099596508704940709683494912
• The square root of 81971738208 is 286307.0697834757
• The cube root of 81971738208 is 4343.9823112127

Scales and comparisons

• 81,971,738,208 seconds is equal to 2,606 years, 23 weeks, 1 day, 23 hours, 16 minutes, 48 seconds.
• To count from 1 to 81,971,738,208 would take you about five thousand, two hundred twelve 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 81971738208 cubic inches would be around 362 feet tall.

Recreational maths with 81971738208

• 81971738208 backwards is 80283717918
• 81971738208 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81971738208's digits is 54
• More coming soon!