81688320
81,688,320 is an even composite number composed of five prime numbers multiplied together.
81688320 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of two hundred sixteen divisors.
Prime factorization of 81688320:
28 × 32 × 5 × 7 × 1013
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 5 × 7 × 1013)See below for interesting mathematical facts about the number 81688320 from the Numbermatics database.
Names of 81688320
- Cardinal: 81688320 can be written as Eighty-one million, six hundred eighty-eight thousand, three hundred twenty.
Scientific notation
- Scientific notation: 8.168832 × 107
Factors of 81688320
Divisors of 81688320
- Number of divisors d(n): 216
-
Complete list of divisors:
1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 28 30 32 35 36 40 42 45 48 56 60 63 64 70 72 80 84 90 96 105 112 120 126 128 140 144 160 168 180 192 210 224 240 252 256 280 288 315 320 336 360 384 420 448 480 504 560 576 630 640 672 720 768 840 896 960 1008 1013 1120 1152 1260 1280 1344 1440 1680 1792 1920 2016 2026 2240 2304 2520 2688 2880 3039 3360 3840 4032 4052 4480 5040 5065 5376 5760 6078 6720 7091 8064 8104 8960 9117 10080 10130 11520 12156 13440 14182 15195 16128 16208 18234 20160 20260 21273 24312 26880 28364 30390 32416 35455 36468 40320 40520 42546 45585 48624 56728 60780 63819 64832 70910 72936 80640 81040 85092 91170 97248 106365 113456 121560 127638 129664 141820 145872 162080 170184 182340 194496 212730 226912 243120 255276 259328 283640 291744 319095 324160 340368 364680 388992 425460 453824 486240 510552 567280 583488 638190 648320 680736 729360 777984 850920 907648 972480 1021104 1134560 1166976 1276380 1296640 1361472 1458720 1701840 1815296 1944960 2042208 2269120 2333952 2552760 2722944 2917440 3403680 3889920 4084416 4538240 5105520 5445888 5834880 6807360 8168832 9076480 10211040 11669760 13614720 16337664 20422080 27229440 40844160 81688320
- Sum of all divisors σ(n): 323328096
- Sum of proper divisors (its aliquot sum) s(n): 241639776
- 81688320 is an abundant number, because the sum of its proper divisors (241639776) is greater than itself. Its abundance is 159951456
Bases of 81688320
- Binary: 1001101111001110111000000002
- Hexadecimal: 0x4DE7700
- Base-36: 1CMV40
Squares and roots of 81688320
- 81688320 squared (816883202) is 6672981624422400
- 81688320 cubed (816883203) is 545104658289936826368000
-
The
square root of 81688320 is 9038.1591045965 -
The
cube root of 81688320 is 433.8970074225
Scales and comparisons
How big is 81688320?- 81,688,320 seconds is equal to 2 years, 31 weeks, 11 hours, 12 minutes.
-
To count from 1 to 81,688,320 would take you about three 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 81688320 cubic inches would be around 36.2 feet tall.
Recreational maths with 81688320
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