920808345600
920,808,345,600 is an even composite number composed of seven prime numbers multiplied together.
What does the number 920808345600 look like?
This visualization shows the relationship between its 7 prime factors (large circles) and 2496 divisors.
920808345600 is an even composite number. It is composed of seven distinct prime numbers multiplied together. It has a total of two thousand, four hundred ninety-six divisors.
Prime factorization of 920808345600:
212 × 33 × 52 × 11 × 13 × 17 × 137
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 3 × 5 × 5 × 11 × 13 × 17 × 137)See below for interesting mathematical facts about the number 920808345600 from the Numbermatics database.
Names of 920808345600
- Cardinal: 920808345600 can be written as Nine hundred twenty billion, eight hundred eight million, three hundred forty-five thousand, six hundred.
Scientific notation
- Scientific notation: 9.208083456 × 1011
Factors of 920808345600
Divisors of 920808345600
- Number of divisors d(n): 2496
-
Complete list of divisors:
1 2 3 4 5 6 8 9 10 11 12 13 15 16 17 18 20 22 24 25 26 27 30 32 33 34 36 39 40 44 45 48 50 51 52 54 55 60 64 65 66 68 72 75 78 80 85 88 90 96 99 100 102 104 108 110 117 120 128 130 132 135 136 137 143 144 150 153 156 160 165 170 176 180 187 192 195 198 200 204 208 216 220 221 225 234 240 255 256 260 264 270 272 274 275 286 288 297 300 306 312 320 325 330 340 351 352 360 374 384 390 396 400 408 411 416 425 429 432 440 442 450 459 468 480 495 510 512 520 528 540 544 548 550 561 572 576 585 594 600 612 624 640 650 660 663 675 680 685 702 704 715 720 748 765 768 780 792 800 816 822 825 832 850 858 864 880 884 900 918 935 936 960 975 990 1020 1024 1040 1056 1080 1088 1096 1100 1105 1122 1144 1152 1170 1188 1200 1224 1233 1248 1275 1280 1287 1300 1320 1326 1350 1360 1370 1404 1408 1430 1440 1485 1496 1507 1530 1536 1560 1584 1600 1632 1644 1650 1664 1683 1700 1716 1728 1755 1760 1768 1781 1800 1836 1870 1872 1920 1950 1980 1989 2040 2048 2055 2080 2112 2145 2160 2176 2192 2200 2210 2244 2288 2295 2304 2329 2340 2376 2400 2431 2448 2466 2475 2496 2550 2560 2574 2600 2640 2652 2700 2720 2740 2805 2808 2816 2860 2880 2925 2970 2992 3014 3060 3072 3120 3168 3200 3264 3288 3300 3315 3328 3366 3400 3425 3432 3456 3510 3520 3536 3562 3575 3600 3672 3699 3740 3744 3825 3840 3861 3900 3960 3978 4080 4096 4110 4160 4224 4290 4320 4352 4384 4400 4420 4488 4521 4576 4590 4608 4658 4675 4680 4752 4800 4862 4896 4932 4950 4992 5049 5100 5120 5148 5200 5280 5304 5343 5400 5440 5480 5525 5610 5616 5632 5720 5760 5850 5940 5967 5984 6028 6120 6144 6165 6240 6336 6400 6435 6528 6576 6600 6630 6656 6732 6800 6850 6864 6912 6987 7020 7040 7072 7124 7150 7200 7293 7344 7398 7425 7480 7488 7535 7650 7680 7722 7800 7920 7956 8160 8220 8320 8415 8448 8580 8640 8704 8768 8775 8800 8840 8905 8976 9042 9152 9180 9216 9316 9350 9360 9504 9600 9724 9792 9864 9900 9945 9984 10098 10200 10240 10275 10296 10400 10560 10608 10686 10725 10800 10880 10960 11050 11220 11232 11264 11440 11475 11520 11645 11700 11880 11934 11968 12056 12155 12240 12288 12330 12480 12672 12800 12870 13056 13152 13200 13260 13312 13464 13563 13600 13700 13728 13824 13974 14025 14040 14080 14144 14248 14300 14400 14586 14688 14796 14850 14960 14976 15070 15300 15360 15444 15600 15840 15912 16029 16320 16440 16575 16640 16830 16896 17160 17280 17408 17536 17550 17600 17680 17810 17952 18084 18304 18360 18432 18495 18632 18700 18720 19008 19200 19305 19448 19584 19591 19728 19800 19890 19968 20196 20400 20480 20550 20592 20800 20961 21120 21216 21372 21450 21600 21760 21879 21920 22100 22440 22464 22528 22605 22880 22950 23040 23290 23400 23760 23868 23936 24112 24310 24480 24660 24960 25245 25344 25600 25619 25740 26112 26304 26400 26520 26624 26715 26928 27126 27200 27400 27456 27648 27948 28050 28080 28160 28288 28496 28600 28800 29172 29376 29592 29700 29835 29920 29952 30140 30277 30600 30720 30825 30888 31200 31680 31824 32058 32175 32640 32880 33150 33280 33660 33792 34320 34560 34816 34935 35072 35100 35200 35360 35620 35904 36168 36465 36608 36720 36864 36990 37264 37400 37440 37675 38016 38400 38610 38896 39168 39182 39456 39600 39780 39936 40392 40689 40800 41100 41184 41600 41922 42075 42240 42432 42744 42900 43200 43520 43758 43840 44200 44525 44880 44928 45056 45210 45760 45900 46080 46580 46800 47520 47736 47872 48087 48224 48620 48960 49320 49725 49920 50490 50688 51200 51238 51480 52224 52608 52800 53040 53248 53430 53856 54252 54400 54800 54912 55296 55896 56100 56160 56320 56576 56992 57200 57600 58225 58344 58752 58773 59184 59400 59670 59840 59904 60280 60554 60775 61200 61440 61650 61776 62400 62883 63360 63648 64116 64350 65280 65637 65760 66300 66560 67320 67584 67815 68640 69120 69632 69870 70144 70200 70400 70720 71240 71808 72336 72930 73216 73440 73980 74528 74800 74880 75350 76032 76800 76857 77220 77792 78336 78364 78912 79200 79560 79872 80145 80784 81378 81600 82200 82368 83200 83844 84150 84480 84864 85488 85800 86400 87040 87516 87680 88400 89050 89760 89856 90420 90831 91520 91800 92160 92475 93160 93600 95040 95472 95744 96174 96448 96525 97240 97920 97955 98640 99450 99840 100980 101376 102400 102476 102960 104448 104805 105216 105600 106080 106860 107712 108504 108800 109395 109600 109824 110592 111792 112200 112320 112640 113025 113152 113984 114400 115200 116450 116688 117504 117546 118368 118800 119340 119680 119808 120560 121108 121550 122400 123300 123552 124800 125766 126225 126720 127296 128095 128232 128700 130560 131274 131520 132600 133120 133575 134640 135168 135630 137280 138240 139740 140288 140400 140800 141440 142480 143616 144672 145860 146432 146880 147960 149056 149175 149600 149760 150700 151385 152064 153600 153714 154440 155584 156672 156728 157824 158400 159120 159744 160290 161568 162756 163200 164400 164736 166400 167688 168300 168960 169728 170976 171600 172800 174080 174675 175032 175360 176319 176800 178100 179520 179712 180840 181662 182325 183040 183600 184320 184950 186320 187200 190080 190944 191488 192348 192896 193050 194480 195840 195910 197280 198900 199680 201960 202752 203445 204952 205920 208896 209610 210432 211200 212160 213720 215424 217008 217600 218790 219200 219648 223584 224400 224640 225280 226050 226304 227968 228800 230400 230571 232900 233376 235008 235092 236736 237600 238680 239360 239616 240435 241120 242216 243100 244800 246600 247104 249600 251532 252450 253440 254592 256190 256464 257400 261120 262548 263040 265200 266240 267150 269280 271260 272493 274560 276480 279480 280576 280800 281600 282880 284960 287232 289344 291720 292864 293760 293865 295920 298112 298350 299200 299520 301400 302770 304128 307200 307428 308880 311168 313344 313456 314415 315648 316800 318240 320580 323136 325512 326400 328185 328800 329472 332800 333047 335376 336600 337920 339075 339456 341952 343200 345600 348160 349350 350064 350720 352638 353600 356200 359040 359424 361680 363324 364650 366080 367200 369900 372640 374400 380160 381888 382976 384285 384696 385792 386100 388960 391680 391820 394560 397800 399360 400725 403920 405504 406890 409904 411840 419220 420864 422400 424320 427440 430848 434016 435200 437580 438400 439296 447168 448800 449280 452100 452608 454155 455936 457600 460800 461142 465800 466752 470016 470184 473472 475200 477360 478720 479232 480870 482240 484432 486200 489600 489775 493200 494208 499200 503064 504900 506880 509184 512380 512928 514800 522240 524025 525096 526080 528957 530400 534300 538560 542520 544986 546975 549120 552960 558960 561152 561600 563200 565760 569920 574464 578688 583440 585728 587520 587730 591840 596224 596700 598400 599040 602800 605540 608256 614856 617760 622336 626688 626912 628830 631296 633600 636480 640475 641160 646272 651024 652800 656370 657600 658944 665600 666094 670752 673200 675840 678150 678912 683904 686400 691200 691713 698700 700128 701440 705276 707200 712400 718080 718848 723360 726648 729300 732160 734400 739800 745280 748800 756925 760320 763776 765952 768570 769392 771584 772200 777920 783360 783640 789120 795600 798720 801450 807840 813780 817479 819808 823680 838440 841728 844800 848640 854880 861696 868032 870400 875160 876800 878592 881595 894336 897600 898560 904200 905216 908310 911872 915200 921600 922284 931600 933504 940032 940368 946944 950400 954720 957440 961740 964480 968864 972400 979200 979550 986400 988416 998400 999141 1006128 1009800 1013760 1017225 1018368 1024760 1025856 1029600 1044480 1048050 1050192 1052160 1057914 1060800 1068600 1077120 1085040 1089972 1093950 1098240 1117920 1123200 1126400 1131520 1139840 1148928 1152855 1157376 1166880 1175040 1175460 1183680 1192448 1193400 1196800 1198080 1202175 1205600 1211080 1216512 1229712 1235520 1244672 1253824 1257660 1262592 1267200 1272960 1280950 1282320 1292544 1302048 1305600 1312740 1315200 1317888 1331200 1332188 1341504 1346400 1356300 1357824 1362465 1367808 1372800 1382400 1383426 1397400 1400256 1402880 1410552 1414400 1424800 1436160 1437696 1446720 1453296 1458600 1464320 1468800 1469325 1479600 1490560 1497600 1513850 1520640 1527552 1537140 1538784 1543168 1544400 1555840 1566720 1567280 1572075 1578240 1591200 1602900 1615680 1627560 1634958 1639616 1640925 1647360 1665235 1676880 1683456 1689600 1697280 1709760 1723392 1736064 1740800 1750320 1753600 1757184 1763190 1788672 1795200 1797120 1808400 1816620 1823744 1830400 1844568 1863200 1867008 1880064 1880736 1893888 1900800 1909440 1914880 1921425 1923480 1928960 1937728 1944800 1958400 1959100 1972800 1976832 1996800 1998282 2012256 2019600 2027520 2034450 2036736 2049520 2051712 2059200 2096100 2100384 2104320 2115828 2121600 2137200 2154240 2170080 2179944 2187900 2196480 2235840 2246400 2263040 2270775 2279680 2297856 2305710 2314752 2333760 2350080 2350920 2367360 2384896 2386800 2393600 2396160 2404350 2411200 2422160 2459424 2471040 2489344 2507648 2515320 2525184 2534400 2545920 2561900 2564640 2585088 2604096 2611200 2625480 2630400 2635776 2644785 2664376 2683008 2692800 2712600 2715648 2724930 2735616 2745600 2764800 2766852 2794800 2800512 2805760 2821104 2828800 2849600 2872320 2893440 2906592 2917200 2928640 2937600 2938650 2959200 2981120 2995200 2997423 3027700 3041280 3055104 3074280 3077568 3086336 3088800 3111680 3133440 3134560 3144150 3156480 3182400 3205800 3231360 3255120 3269916 3279232 3281850 3294720 3330470 3353760 3379200 3394560 3419520 3446784 3458565 3472128 3500640 3507200 3526380 3577344 3590400 3594240 3616800 3633240 3647488 3660800 3689136 3726400 3734016 3761472 3787776 3801600 3818880 3829760 3842850 3846960 3857920 3875456 3889600 3916800 3918200 3945600 3953664 3993600 3996564 4024512 4039200 4068900 4073472 4087395 4099040 4103424 4118400 4192200 4200768 4208640 4231656 4243200 4274400 4308480 4340160 4359888 4375800 4392960 4407975 4471680 4492800 4526080 4541550 4559360 4611420 4629504 4667520 4700160 4701840 4734720 4769792 4773600 4787200 4808700 4822400 4844320 4918848 4942080 4978688 4995705 5015296 5030640 5050368 5068800 5091840 5123800 5129280 5170176 5208192 5222400 5250960 5260800 5271552 5289570 5328752 5366016 5385600 5425200 5449860 5471232 5491200 5533704 5589600 5601024 5642208 5657600 5699200 5744640 5764275 5786880 5813184 5834400 5875200 5877300 5918400 5962240 5990400 5994846 6055400 6082560 6110208 6148560 6155136 6172672 6177600 6223360 6269120 6288300 6312960 6364800 6411600 6462720 6510240 6539832 6558464 6563700 6589440 6660940 6707520 6789120 6812325 6839040 6893568 6917130 6944256 7001280 7014400 7052760 7154688 7180800 7188480 7233600 7266480 7294976 7321600 7378272 7452800 7468032 7522944 7575552 7603200 7637760 7685700 7693920 7715840 7750912 7779200 7833600 7836400 7891200 7907328 7993128 8049024 8078400 8137800 8146944 8174790 8198080 8206848 8236800 8326175 8384400 8401536 8417280 8463312 8486400 8548800 8616960 8680320 8719776 8751600 8785920 8815950 8943360 8985600 8992269 9083100 9118720 9222840 9259008 9335040 9400320 9403680 9469440 9539584 9547200 9574400 9617400 9644800 9688640 9837696 9884160 9957376 9991410 10030592 10061280 10137600 10183680 10247600 10258560 10340352 10416384 10501920 10521600 10579140 10657504 10732032 10771200 10850400 10899720 10942464 10982400 11067408 11179200 11202048 11284416 11315200 11398400 11489280 11528550 11573760 11626368 11668800 11750400 11754600 11836800 11924480 11980800 11989692 12110800 12220416 12297120 12310272 12355200 12446720 12538240 12576600 12625920 12729600 12823200 12925440 13020480 13079664 13116928 13127400 13178880 13223925 13321880 13415040 13578240 13624650 13678080 13834260 13888512 14002560 14028800 14105520 14309376 14361600 14467200 14532960 14643200 14756544 14905600 14936064 14987115 15045888 15151104 15206400 15275520 15371400 15387840 15431680 15501824 15558400 15667200 15672800 15782400 15814656 15986256 16098048 16156800 16275600 16349580 16396160 16413696 16473600 16652350 16768800 16803072 16926624 16972800 17097600 17233920 17292825 17360640 17439552 17503200 17631900 17886720 17971200 17984538 18166200 18237440 18445680 18518016 18670080 18807360 18938880 19094400 19148800 19234800 19289600 19377280 19675392 19768320 19982820 20061184 20122560 20367360 20436975 20495200 20517120 20680704 20832768 21003840 21043200 21158280 21315008 21464064 21542400 21700800 21799440 21884928 21964800 22134816 22358400 22404096 22568832 22630400 22796800 23057100 23147520 23252736 23337600 23500800 23509200 23673600 23848960 23979384 24221600 24440832 24594240 24620544 24710400 24893440 24978525 25076480 25153200 25251840 25459200 25646400 25850880 26040960 26159328 26233856 26254800 26357760 26447850 26643760 26830080 27249300 27356160 27668520 27777024 28005120 28211040 28618752 28723200 28934400 29065920 29513088 29811200 29872128 29974230 30091776 30412800 30551040 30742800 30775680 30863360 31003648 31116800 31345600 31564800 31972512 32196096 32313600 32551200 32699160 32792320 32827392 32947200 33304700 33537600 33606144 33853248 33945600 34195200 34467840 34585650 34721280 34879104 35006400 35263800 35773440 35942400 35969076 36332400 36474880 36891360 37340160 37614720 37877760 38188800 38469600 38579200 38754560 39350784 39536640 39965640 40122368 40245120 40734720 40873950 40990400 41034240 41665536 42007680 42086400 42316560 42630016 42928128 43084800 43401600 43598880 43929600 44269632 44716800 44808192 44961345 45137664 45593600 46114200 46295040 46505472 46675200 47001600 47018400 47347200 47697920 47958768 48443200 49188480 49241088 49420800 49786880 49957050 50152960 50306400 50918400 51292800 51701760 52081920 52318656 52467712 52509600 52895700 53287520 53660160 54498600 54712320 55337040 55554048 56010240 56422080 57446400 57868800 58131840 59026176 59622400 59948460 60183552 61102080 61485600 61551360 62007296 62233600 62691200 63129600 63945024 64392192 64627200 65102400 65398320 65584640 65654784 65894400 66609400 67075200 67212288 67706496 67891200 68390400 69171300 69442560 69758208 70012800 70527600 71546880 71938152 72664800 73782720 74680320 74935575 75229440 75755520 76377600 76939200 77158400 77509120 78701568 79073280 79931280 80244736 80490240 81747900 81980800 82068480 83331072 84015360 84633120 85260032 85856256 86169600 86803200 87197760 88539264 89433600 89616384 89922690 90275328 91187200 92228400 92590080 93010944 93350400 94036800 94694400 95917536 96886400 98376960 98482176 98841600 99914100 100305920 100612800 101836800 102585600 103403520 104163840 104637312 104935424 105019200 105791400 106575040 107320320 108997200 109424640 110674080 112020480 112844160 115737600 116263680 118052352 119244800 119896920 120367104 122204160 122971200 123102720 124014592 124467200 125382400 126259200 127890048 128784384 129254400 130204800 130796640 131169280 131788800 133218800 134150400 134424576 135412992 136780800 138342600 138885120 139516416 140025600 141055200 143093760 143876304 145329600 147565440 149360640 149871150 150458880 152755200 153878400 154316800 155018240 157403136 159862560 160980480 163495800 163961600 164136960 166662144 168030720 169266240 170520064 172339200 173606400 174395520 177078528 178867200 179845380 180550656 182374400 184456800 186021888 186700800 188073600 189388800 191835072 193772800 196753920 196964352 197683200 199828200 200611840 201225600 203673600 205171200 208327680 209274624 210038400 211582800 213150080 214640640 217994400 221348160 224040960 224806725 225688320 231475200 232527360 236104704 238489600 239793840 240734208 245942400 246205440 248934400 250764800 255780096 257568768 258508800 260409600 261593280 262338560 266437600 268300800 268849152 270825984 273561600 276685200 277770240 279032832 280051200 282110400 287752608 290659200 295130880 299742300 300917760 305510400 307756800 310036480 314806272 319725120 321960960 326991600 327923200 328273920 336061440 338532480 341040128 347212800 348791040 354157056 357734400 359690760 361101312 368913600 372043776 373401600 376147200 378777600 383670144 387545600 393507840 395366400 399656400 401223680 402451200 410342400 416655360 418549248 420076800 423165600 426300160 429281280 435988800 442696320 448081920 449613450 451376640 462950400 465054720 472209408 479587680 491884800 492410880 501529600 511560192 517017600 520819200 523186560 524677120 532875200 536601600 541651968 547123200 553370400 558065664 560102400 564220800 575505216 581318400 590261760 599484600 601835520 611020800 615513600 620072960 639450240 643921920 653983200 655846400 672122880 677064960 682080256 694425600 697582080 708314112 715468800 719381520 722202624 737827200 746803200 752294400 767340288 775091200 787015680 799312800 804902400 820684800 833310720 837098496 840153600 846331200 852600320 871977600 885392640 899226900 902753280 930109440 944418816 959175360 983769600 984821760 1003059200 1023120384 1041638400 1046373120 1065750400 1073203200 1083303936 1106740800 1116131328 1120204800 1128441600 1151010432 1162636800 1180523520 1198969200 1203671040 1231027200 1278900480 1287843840 1307966400 1311692800 1344245760 1354129920 1364160512 1388851200 1395164160 1416628224 1438763040 1475654400 1504588800 1534680576 1550182400 1574031360 1598625600 1609804800 1641369600 1674196992 1680307200 1692662400 1705200640 1743955200 1770785280 1798453800 1805506560 1860218880 1918350720 1967539200 2006118400 2046240768 2083276800 2092746240 2131500800 2146406400 2166607872 2213481600 2240409600 2256883200 2302020864 2325273600 2361047040 2397938400 2462054400 2557800960 2615932800 2623385600 2708259840 2790328320 2833256448 2877526080 2951308800 3009177600 3069361152 3100364800 3197251200 3219609600 3348393984 3360614400 3385324800 3410401280 3487910400 3541570560 3596907600 3611013120 3836701440 3935078400 4092481536 4166553600 4185492480 4263001600 4426963200 4513766400 4604041728 4650547200 4722094080 4795876800 4924108800 5115601920 5231865600 5416519680 5580656640 5755052160 5902617600 6018355200 6138722304 6394502400 6439219200 6721228800 6770649600 6820802560 6975820800 7083141120 7193815200 7673402880 7870156800 8370984960 8526003200 8853926400 9027532800 9208083456 9301094400 9591753600 10231203840 10463731200 10833039360 11510104320 11805235200 12277444608 12789004800 13541299200 13951641600 14166282240 14387630400 15346805760 16741969920 17052006400 17707852800 18055065600 18416166912 19183507200 20462407680 20927462400 23020208640 23610470400 25578009600 27082598400 27903283200 28775260800 30693611520 34104012800 35415705600 36832333824 38367014400 41854924800 46040417280 51156019200 54165196800 57550521600 61387223040 70831411200 76734028800 83709849600 92080834560 102312038400 115101043200 153468057600 184161669120 230202086400 306936115200 460404172800 920808345600
- Sum of all divisors σ(n): 4238571214080
- Sum of proper divisors (its aliquot sum) s(n): 3317762868480
- 920808345600 is an abundant number, because the sum of its proper divisors (3317762868480) is greater than itself. Its abundance is 2396954522880
Bases of 920808345600
- Binary: 11010110011001000111010001010000000000002
- Hexadecimal: 0xD664745000
- Base-36: BR0HIIO0
Squares and roots of 920808345600
- 920808345600 squared (9208083456002) is 847888009326609039360000
- 920808345600 cubed (9208083456003) is 780742355122112239591086882816000000
-
The
square root of 920808345600 is 959587.5914162291 -
The
cube root of 920808345600 is 9728.7359352059
Scales and comparisons
How big is 920808345600?- 920,808,345,600 seconds is equal to 29,278 years, 44 weeks, 4 days.
-
To count from 1 to 920,808,345,600 would take you about fifty-eight thousand, five hundred fifty-seven 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 920808345600 cubic inches would be around 810.7 feet tall.
Recreational maths with 920808345600
- 920808345600 backwards is 006543808029
- 920808345600 is a
Harshad number . - The number of decimal digits it has is: 12
- The sum of 920808345600's digits is 45
- 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 920808345600 - Facts about the integer". Numbermatics.com. 2024. Web. 9 May 2024.
APA style:
Numbermatics. (2024). Number 920808345600 - Facts about the integer. Retrieved 9 May 2024, from https://numbermatics.com/n/920808345600/
Chicago style:
Numbermatics. 2024. "Number 920808345600 - Facts about the integer". https://numbermatics.com/n/920808345600/
The information we have on file for 920808345600 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 920808345600, math, Factors of 920808345600, curriculum, school, college, exams, university, Prime factorization of 920808345600, STEM, science, technology, engineering, physics, economics, calculator, nine hundred twenty billion, eight hundred eight million, three hundred forty-five thousand, six hundred.