81841602870720
81,841,602,870,720 is an even composite number composed of seven prime numbers multiplied together.
What does the number 81841602870720 look like?
This visualization shows the relationship between its 7 prime factors (large circles) and 2268 divisors.
81841602870720 is an even composite number. It is composed of seven distinct prime numbers multiplied together. It has a total of two thousand, two hundred sixty-eight divisors.
Prime factorization of 81841602870720:
26 × 32 × 5 × 72 × 11 × 532 × 1372
(2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 5 × 7 × 7 × 11 × 53 × 53 × 137 × 137)See below for interesting mathematical facts about the number 81841602870720 from the Numbermatics database.
Names of 81841602870720
- Cardinal: 81841602870720 can be written as Eighty-one trillion, eight hundred forty-one billion, six hundred two million, eight hundred seventy thousand, seven hundred twenty.
Scientific notation
- Scientific notation: 8.184160287072 × 1013
Factors of 81841602870720
Divisors of 81841602870720
- Number of divisors d(n): 2268
-
Complete list of divisors:
1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 18 20 21 22 24 28 30 32 33 35 36 40 42 44 45 48 49 53 55 56 60 63 64 66 70 72 77 80 84 88 90 96 98 99 105 106 110 112 120 126 132 137 140 144 147 154 159 160 165 168 176 180 192 196 198 210 212 220 224 231 240 245 252 264 265 274 280 288 294 308 315 318 320 330 336 352 360 371 385 392 396 411 420 424 440 441 448 462 477 480 490 495 504 528 530 539 548 560 576 583 588 616 630 636 660 672 685 693 704 720 735 742 770 784 792 795 822 840 848 880 882 924 954 959 960 980 990 1008 1056 1060 1078 1096 1113 1120 1155 1166 1176 1232 1233 1260 1272 1320 1344 1370 1386 1440 1470 1484 1507 1540 1568 1584 1590 1617 1644 1680 1696 1749 1760 1764 1848 1855 1908 1918 1960 1980 2016 2055 2112 2120 2156 2192 2205 2226 2240 2310 2332 2352 2385 2464 2466 2520 2544 2597 2640 2695 2740 2772 2809 2877 2880 2915 2940 2968 3014 3080 3136 3168 3180 3234 3288 3339 3360 3392 3465 3498 3520 3528 3696 3710 3816 3836 3920 3960 4032 4081 4110 4240 4312 4384 4410 4452 4521 4620 4664 4704 4770 4795 4851 4928 4932 5040 5088 5194 5247 5280 5390 5480 5544 5565 5618 5754 5830 5880 5936 6028 6160 6165 6336 6360 6468 6576 6678 6713 6720 6930 6996 7056 7261 7392 7420 7535 7632 7672 7791 7840 7920 8085 8162 8220 8427 8480 8624 8631 8745 8768 8820 8904 9042 9240 9328 9408 9540 9590 9702 9864 10080 10176 10388 10494 10549 10560 10780 10960 11088 11130 11236 11508 11660 11760 11872 12056 12243 12320 12330 12720 12936 12985 13152 13356 13426 13563 13860 13992 14045 14112 14385 14522 14784 14840 15070 15264 15344 15582 15680 15840 16170 16324 16440 16695 16854 16960 17248 17262 17490 17640 17808 18084 18480 18656 18769 19080 19180 19404 19663 19728 20139 20160 20405 20776 20988 21098 21560 21783 21920 22176 22260 22472 22605 23016 23320 23373 23520 23744 24112 24255 24486 24640 24660 25281 25440 25872 25970 26235 26304 26712 26852 27126 27720 27984 28090 28224 28567 28770 29044 29680 30140 30528 30688 30899 31164 31647 31680 32340 32648 32880 33390 33565 33708 34496 34524 34980 35280 35616 36168 36305 36729 36960 37312 37538 38160 38360 38808 38955 39326 39456 40278 40810 41552 41976 42135 42196 43120 43155 43566 43840 44352 44520 44944 45210 46032 46640 46746 47040 48224 48510 48972 49320 50562 50827 50880 51744 51940 52470 52745 53424 53704 54252 55440 55968 56180 56307 57134 57540 58088 58989 59360 60280 60417 61215 61376 61798 62328 63294 64680 65296 65349 65760 66780 67130 67416 67815 69048 69960 70560 71232 72336 72610 73458 73843 73920 75076 76320 76720 77616 77910 78652 78912 79871 80556 81620 83104 83952 84270 84392 85701 86240 86310 87132 89040 89888 90420 92064 92697 93280 93492 93845 94941 96448 97020 97944 98315 98640 100695 101124 101654 103488 103880 104940 105490 106848 107408 108504 108915 110880 111936 112360 112614 114268 115080 116176 116865 117978 118720 120560 120834 122430 123596 124656 126405 126588 129360 130592 130698 131383 131520 133560 134260 134832 135630 137641 138096 139920 141120 142835 144672 145220 146916 147686 150152 152481 152640 153440 154495 155232 155820 157304 158235 159742 161112 163240 166208 167904 168540 168784 168921 171402 172480 172620 174264 176967 178080 179776 180840 183645 184128 185394 186560 186984 187690 189882 194040 195888 196630 197280 201390 202248 203308 206459 207760 209880 210980 213696 214816 216293 217008 217830 221529 221760 224720 225228 228536 230160 232352 233730 235956 239613 241120 241668 244860 247192 249312 252810 253176 254135 257103 258720 261184 261396 262766 267120 268520 269664 271260 275282 276192 278091 279840 281535 285670 289344 290440 293832 294945 295372 300304 302085 304962 306880 308990 310464 311640 314608 316470 319484 322224 326480 326745 335808 337080 337568 337842 342804 345240 348528 353934 355789 356160 361680 367290 369215 370788 373968 375380 379764 384833 388080 391776 393260 394149 394560 399355 402780 404496 406616 412918 412923 415520 419760 421960 428505 429632 432586 434016 435660 443058 449440 450456 457072 457443 460320 463485 464704 467460 471912 474705 479226 482240 483336 489720 494384 498624 505620 506352 508270 514206 517440 522792 525532 534240 537040 539328 542520 550564 552384 556182 559097 559680 563070 571340 580880 587664 589890 590744 600608 604170 609924 617980 619377 623280 629216 632940 638968 644448 648879 652960 653490 656915 664587 674160 675136 675684 685608 688205 690480 697056 707868 711578 718839 723360 734580 738430 741576 747936 750760 759528 762405 769666 776160 783552 786520 788298 798710 805560 808992 813232 825836 825846 831040 839520 843920 844605 857010 865172 868032 871320 884835 886116 898880 900912 914144 914886 919681 920640 926970 934920 943824 949410 958452 966672 979440 988768 994757 1011240 1012704 1016540 1028412 1032295 1045584 1051064 1067367 1068480 1074080 1081465 1085040 1101128 1107645 1112364 1118194 1126140 1142680 1154499 1161760 1175328 1179780 1181488 1182447 1198065 1201216 1208340 1219848 1235960 1238754 1238769 1246560 1258432 1265880 1277936 1285515 1288896 1297758 1305920 1306980 1313830 1329174 1348320 1351368 1371216 1376410 1380960 1390455 1394112 1415736 1423156 1437678 1445213 1446720 1469160 1476860 1483152 1495872 1501520 1514051 1519056 1524810 1539332 1552320 1573040 1576596 1597420 1611120 1617984 1626464 1651672 1651692 1677291 1679040 1687840 1689210 1714020 1730344 1742640 1769670 1772232 1778945 1801824 1828288 1829772 1839362 1853940 1858131 1869840 1887648 1898820 1916904 1924165 1933344 1946637 1958880 1970745 1977536 1989514 2022480 2025408 2033080 2056824 2064590 2064615 2091168 2102128 2134734 2148160 2162930 2170080 2202256 2215290 2224728 2236388 2252280 2285360 2287215 2308998 2323520 2350656 2359560 2362976 2364894 2396130 2416680 2439696 2471920 2477508 2477538 2493120 2531760 2555872 2571030 2595516 2613960 2627660 2658348 2693831 2696640 2702736 2742432 2752820 2759043 2761920 2780910 2795485 2831472 2846312 2875356 2890426 2938320 2953720 2966304 2984271 3003040 3028102 3038112 3049620 3078664 3096885 3146080 3153192 3194840 3202101 3222240 3244395 3252928 3303344 3303384 3322935 3354582 3375680 3378420 3428040 3460688 3463497 3485280 3539340 3544464 3557890 3594195 3603648 3659544 3678724 3707880 3716262 3739680 3775296 3797640 3833808 3848330 3866688 3893274 3913679 3917760 3941490 3979028 4044960 4066160 4113648 4129180 4129230 4182336 4204256 4233163 4269468 4325860 4335639 4340160 4404512 4430580 4449456 4472776 4504560 4542153 4570720 4574430 4598405 4617996 4719120 4725952 4729788 4792260 4833360 4879392 4943840 4955016 4955076 4973785 5031873 5063520 5111744 5142060 5191032 5227920 5255320 5316696 5336835 5387662 5405472 5484864 5505640 5518086 5561820 5590970 5662944 5692624 5750712 5772495 5780852 5876640 5907440 5912235 5932608 5968542 6006080 6056204 6076224 6099240 6157328 6193770 6193845 6292160 6306384 6389680 6404202 6444480 6488790 6606688 6606768 6645870 6709164 6756840 6856080 6921376 6926994 6963299 6970560 7078680 7088928 7115780 7188390 7226065 7319088 7357448 7415760 7432524 7479360 7570255 7595280 7667616 7696660 7786548 7827358 7882980 7958056 8081493 8089920 8132320 8227296 8258360 8258460 8277129 8386455 8408512 8466326 8538936 8651720 8671278 8809024 8861160 8898912 8945552 8952813 9009120 9084306 9141440 9148860 9196810 9235992 9290655 9438240 9459576 9584520 9666720 9733185 9758784 9887680 9910032 9910152 9947570 10063746 10116491 10127040 10284120 10382064 10455840 10510640 10633392 10673670 10775324 10810944 10942327 11011280 11036172 11123640 11181940 11325888 11385248 11501424 11544990 11561704 11741037 11753280 11814880 11824470 11937084 12112408 12198480 12314656 12387540 12387690 12612768 12699489 12779360 12808404 12977580 13006917 13213376 13213536 13291740 13418328 13469155 13513680 13626459 13712160 13795215 13842752 13853988 13926598 14157360 14177856 14231560 14376780 14452130 14638176 14714896 14831520 14865048 14921355 15140510 15190560 15335232 15393320 15573096 15654716 15765960 15916112 16010505 16162986 16264640 16454592 16516720 16516920 16554258 16772910 16932652 17077872 17303440 17317485 17342556 17722320 17797824 17891104 17905626 18018240 18168612 18297720 18393620 18471984 18581310 18856817 18876480 18919152 19169040 19333440 19466370 19568395 19820064 19820304 19895140 20127492 20232982 20568240 20764128 20889897 20911680 21021280 21165815 21266784 21347340 21550648 21678195 21884654 22022560 22072344 22247280 22363880 22710765 22770496 23002848 23089980 23123408 23482074 23629760 23648940 23874168 24224816 24244479 24396960 24629312 24775080 24775380 25159365 25225536 25398978 25558720 25616808 25955160 26013834 26427072 26583480 26836656 26938310 27027360 27252918 27424320 27590430 27707976 27853196 28314720 28463120 28753560 28904260 29276352 29429792 29632141 29663040 29730096 29842710 30281020 30349473 30381120 30786640 31146192 31309432 31531920 31832224 32021010 32325972 32826981 33033440 33033840 33108516 33545820 33865304 34155744 34606880 34634970 34685112 34816495 35223111 35444640 35782208 35811252 36337224 36595440 36787240 36943968 37162620 37713634 37838304 38098467 38338080 38932740 39136790 39640128 39640608 39790280 40254984 40407465 40465964 41136480 41385645 41528256 41779794 42042560 42331630 42533568 42694680 43101296 43356390 43769308 44045120 44144688 44494560 44727760 44764065 45421530 46005696 46179960 46246816 46964148 47297880 47748336 48449632 48488958 48743093 48793920 49550160 49550760 50318730 50582455 50797956 51233616 51910320 52027668 52722121 53166960 53673312 53876620 54054720 54505836 54711635 55180860 55415952 55706392 56570451 56629440 56926240 57507120 57808520 58705185 58859584 59264282 59460192 59685420 60562040 60698946 61573280 62292384 62618864 62669691 63063840 63497445 63664448 64042020 64651944 65034585 65653962 66066880 66067680 66217032 67091640 67730608 68132295 68311488 69213760 69269940 69370224 69632990 70446222 70889280 71622504 72674448 73190880 73574480 73887936 74325240 75427268 75676608 76196934 76596289 76676160 77865480 78273580 79281216 79580560 80509968 80814930 80931928 82272960 82771290 83559588 84663260 85389360 86202592 86712780 87538616 88289376 88896423 88989120 89455520 89528130 90843060 91048419 92359920 92493632 93928296 94284085 94595760 95496672 96899264 96977916 97486186 98480943 99100320 99101520 100637460 101164910 101595912 102467232 103820640 104055336 104449485 105444242 106333920 107346624 107753240 109011672 109423270 110361720 110831904 111412784 113140902 113852480 115014240 115617040 117410370 118528564 118920384 119370840 121124080 121222395 121397892 123146560 124584768 125237728 125339382 126127680 126994890 128084040 129303888 130069170 131307924 132135360 132434064 134183280 135461216 136264590 138539880 138740448 139265980 140892444 143245008 145348896 146229279 146381760 147148960 148160705 148650480 150854536 151747365 152393868 153192578 155730960 156547160 158166363 159161120 161019936 161629860 161863856 164134905 165542580 167119176 169326520 169711353 170778720 172405184 173425560 175077232 176115555 176578752 177792846 178911040 179056260 181686120 182096838 184719840 187856592 188568170 189191520 190492335 190993344 193955832 194972372 196961886 198200640 198203040 201274920 202329820 203191824 204934464 207424987 207641280 208110672 208898970 210888484 212667840 215506480 218023344 218846540 220723440 221663808 222825568 226281804 229788867 230028480 231234080 234820740 237057128 238741680 242248160 242444790 242795784 243715465 250475456 250678764 253989780 256168080 258607776 260138340 262615848 263610605 264868128 266689269 268366560 270922432 272529180 277079760 277480896 278531960 281784888 282852255 286490016 290697792 292458558 294297920 296321410 297300960 301709072 303494730 304787736 306385156 311461920 313094320 313348455 316332726 318322240 322039872 323259720 323727712 328269810 331085160 334238352 338653040 339422706 341557440 346851120 350154464 352231110 355585692 358112520 363372240 364193676 369054847 369439680 375713184 377136340 378383040 380984670 382981445 387911664 389944744 393923772 396406080 402549840 404659640 406383648 414849974 416221344 417797940 421776968 431012960 436046688 437693080 438687837 441446880 444482115 445651136 452563608 455242095 459577734 462468160 469641480 474114256 474499089 477483360 484496320 484889580 485591568 487430930 492404715 501357528 507979560 512336160 517215552 520276680 525231696 527221210 529736256 533378538 536174023 536733120 545058360 554159520 557063920 563569776 565704510 572980032 579943331 584917116 592642820 594601920 603418144 606989460 609575472 612770312 622274961 622923840 626188640 626696910 632665452 646519440 647455424 656539620 662170320 668476704 677306080 678845412 689366601 693702240 700308928 704462220 711171384 716225040 726744480 728387352 731146395 738109694 751426368 754272680 761969340 765962890 775823328 779889488 787847544 790831815 805099680 809319280 812767296 829699948 832442688 835595880 843553936 848556765 862025920 872093376 875386160 877375674 882893760 888964230 905127216 910484190 919155468 939282960 948228512 948998178 954966720 969779160 971183136 974861860 984809430 1002715056 1015959120 1024672320 1037124935 1040553360 1050463392 1054442420 1066757076 1072348046 1090116720 1107164541 1108319040 1114127840 1127139552 1131409020 1148944335 1159886662 1169834232 1185285640 1206836288 1213978920 1219150944 1225540624 1244549922 1252377280 1253393820 1265330904 1293038880 1313079240 1324340640 1333446345 1336953408 1354612160 1357690824 1378733202 1387404480 1408924440 1422342768 1432450080 1453488960 1456774704 1462292790 1476219388 1508545360 1523938680 1531925780 1551646656 1559778976 1575695088 1581663630 1608522069 1610199360 1618638560 1659399896 1671191760 1687107872 1697113530 1739829993 1750772320 1754751348 1777928460 1810254432 1820968380 1838310936 1845274235 1866824883 1878565920 1896457024 1897996356 1939558320 1942366272 1949723720 1969618860 2005430112 2031918240 2074249870 2081106720 2100926784 2108884840 2133514152 2144696092 2180233440 2193439185 2214329082 2228255680 2254279104 2262818040 2297888670 2319773324 2339668464 2370571280 2372495445 2427957840 2438301888 2451081248 2489099844 2506787640 2530661808 2583383929 2586077760 2626158480 2648681280 2666892690 2680870115 2715381648 2757466404 2817848880 2844685536 2864900160 2899716655 2913549408 2924585580 2952438776 3017090720 3047877360 3063851560 3111374805 3119557952 3151390176 3163327260 3217044138 3237277120 3318799792 3321493623 3342383520 3374215744 3394227060 3446833005 3479659986 3501544640 3509502696 3555856920 3620508864 3641936760 3676621872 3690548470 3733649766 3757131840 3795992712 3879116640 3899447440 3939237720 4010860224 4059603317 4063836480 4148499740 4162213440 4217769680 4267028304 4289392184 4360466880 4386878370 4428658164 4525636080 4595777340 4639546648 4679336928 4741142560 4744990890 4825566207 4855915680 4902162496 4978199688 5013575280 5061323616 5166767858 5219489979 5252316960 5333785380 5361740230 5430763296 5514932808 5535822705 5635697760 5689371072 5799433310 5827098816 5849171160 5904877552 6034181440 6095754720 6127703120 6222749610 6302780352 6326654520 6434088276 6637599584 6642987246 6684767040 6788454120 6893666010 6959319972 7019005392 7111713840 7283873520 7353243744 7381096940 7467299532 7591985424 7750151787 7758233280 7798894880 7878475440 8042610345 8119206634 8296999480 8435539360 8534056608 8578784368 8699149965 8773756740 8857316328 9051272160 9191554680 9279093296 9334124415 9358673856 9482285120 9489981780 9651132414 9711831360 9956399376 10027150560 10122647232 10333535716 10438979958 10504633920 10667570760 10723480460 10861526592 11029865616 11071645410 11271395520 11598866620 11698342320 11809755104 12178809951 12191509440 12255406240 12445499220 12653309040 12868176552 12916919645 13275199168 13285974492 13576908240 13787332020 13918639944 14038010784 14223427680 14567747040 14706487488 14762193880 14934599064 15183970848 15500303574 15597789760 15756950880 16085220690 16238413268 16593998960 16607468115 16871078720 17068113216 17157568736 17398299930 17547513480 17714632656 18102544320 18383109360 18558186592 18668248830 18979963560 19302264828 19912798752 20054301120 20298016585 20667071432 20877959916 21335141520 21446960920 22059731232 22143290820 23197733240 23250455361 23396684640 23619510208 24127831035 24357619902 24510812480 24890998440 25306618080 25736353104 25833839290 26097449895 26571948984 27153816480 27574664040 27837279888 28076021568 28417223219 28446855360 29135494080 29524387760 29869198128 30367941696 31000607148 31513901760 32170441380 32476826536 33187997920 33214936230 34315137472 34796599860 35095026960 35429265312 36536429853 36766218720 37116373184 37336497660 37959927120 38604529656 38750758935 39825597504 40596033170 41334142864 41755919832 42670283040 42893921840 44119462464 44286581640 46395466480 46500910722 46793369280 48255662070 48715239804 49781996880 50613236160 51472706208 51667678580 52194899790 53143897968 54307632960 55149328080 55674559776 56834446438 59048775520 59738396256 60894049755 62001214296 64340882760 64953653072 66375995840 66429872460 69593199720 70190053920 70858530624 73072859706 73532437440 74672995320 75919854240 77209059312 77501517870 81192066340 82668285728 83511839664 85251669657 85340566080 85787843680 88573163280 92790932960 93001821444 96511324140 97430479608 99563993760 102945412416 103335357160 104389799580 106287795936 110298656160 111349119552 113668892876 116252276805 118097551040 119476792512 121788099510 124002428592 128681765520 129907306144 132859744920 139186399440 140380107840 142086116095 146145719412 149345990640 151839708480 154418118624 155003035740 162384132680 165336571456 167023679328 170503339314 171575687360 177146326560 182682149265 185581865920 186003642888 193022648280 194860959216 199127987520 206670714320 208779599160 212575591872 220597312320 227337785752 232504553610 243576199020 248004857184 255755008971 257363531040 259814612288 265719489840 278372798880 284172232190 292291438824 298691981280 308836237248 310006071480 324768265360 334047358656 341006678628 354292653120 365364298530 372007285776 386045296560 389721918432 413341428640 417559198320 426258348285 454675571504 465009107220 487152398040 496009714368 511510017942 514727062080 531438979680 556745597760 568344464380 584582877648 597383962560 620012142960 649536530720 682013357256 730728597060 744014571552 772090593120 779443836864 826682857280 835118396640 852516696570 909351143008 930018214440 974304796080 1023020035884 1062877959360 1136688928760 1169165755296 1240024285920 1278775044855 1299073061440 1364026714512 1461457194120 1488029143104 1544181186240 1670236793280 1705033393140 1818702286016 1860036428880 1948609592160 2046040071768 2273377857520 2338331510592 2480048571840 2557550089710 2728053429024 2922914388240 3410066786280 3720072857760 3897219184320 4092080143536 4546755715040 5115100179420 5456106858048 5845828776480 6820133572560 7440145715520 8184160287072 9093511430080 10230200358840 11691657552960 13640267145120 16368320574144 20460400717680 27280534290240 40920801435360 81841602870720
- Sum of all divisors σ(n): 366773878316664
- Sum of proper divisors (its aliquot sum) s(n): 284932275445944
- 81841602870720 is an abundant number, because the sum of its proper divisors (284932275445944) is greater than itself. Its abundance is 203090672575224
Bases of 81841602870720
- Binary: 100101001101111001110111010101010111101110000002
- Hexadecimal: 0x4A6F3BAABDC0
- Base-36: T0DIH9F40
Squares and roots of 81841602870720
- 81841602870720 squared (818416028707202) is 6698047960448644145033318400
- 81841602870720 cubed (818416028707203) is 548178981188073995679290551195487797248000
-
The
square root of 81841602870720 is 9046634.8920866703 -
The
cube root of 81841602870720 is 43416.8231110481
Scales and comparisons
How big is 81841602870720?- 81,841,602,870,720 seconds is equal to 2,602,309 years, 42 weeks, 3 days, 23 hours, 12 minutes.
-
To count from 1 to 81,841,602,870,720 would take you about six million, five hundred five thousand, seven hundred seventy-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 81841602870720 cubic inches would be around 3618.1 feet tall.
Recreational maths with 81841602870720
- 81841602870720 backwards is 02707820614818
- The number of decimal digits it has is: 14
- The sum of 81841602870720's digits is 54
- More coming soon!
Link to this page
HTML: To link to this page, just copy and paste the link below into your blog, web page or email.
BBCODE: To link to this page in a forum post or comment box, just copy and paste the link code below:
Cite this page
MLA style:
"Number 81841602870720 - Facts about the integer". Numbermatics.com. 2024. Web. 19 June 2024.
APA style:
Numbermatics. (2024). Number 81841602870720 - Facts about the integer. Retrieved 19 June 2024, from https://numbermatics.com/n/81841602870720/
Chicago style:
Numbermatics. 2024. "Number 81841602870720 - Facts about the integer". https://numbermatics.com/n/81841602870720/
The information we have on file for 81841602870720 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!
Keywords: Divisors of 81841602870720, math, Factors of 81841602870720, curriculum, school, college, exams, university, Prime factorization of 81841602870720, STEM, science, technology, engineering, physics, economics, calculator, eighty-one trillion, eight hundred forty-one billion, six hundred two million, eight hundred seventy thousand, seven hundred twenty.