81442920
81,442,920 is an even composite number composed of seven prime numbers multiplied together.
81442920 is an even composite number. It is composed of seven distinct prime numbers multiplied together. It has a total of two hundred fifty-six divisors.
Prime factorization of 81442920:
23 × 3 × 5 × 13 × 17 × 37 × 83
(2 × 2 × 2 × 3 × 5 × 13 × 17 × 37 × 83)See below for interesting mathematical facts about the number 81442920 from the Numbermatics database.
Names of 81442920
- Cardinal: 81442920 can be written as Eighty-one million, four hundred forty-two thousand, nine hundred twenty.
Scientific notation
- Scientific notation: 8.144292 × 107
Factors of 81442920
Divisors of 81442920
- Number of divisors d(n): 256
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Complete list of divisors:
1 2 3 4 5 6 8 10 12 13 15 17 20 24 26 30 34 37 39 40 51 52 60 65 68 74 78 83 85 102 104 111 120 130 136 148 156 166 170 185 195 204 221 222 249 255 260 296 312 332 340 370 390 408 415 442 444 481 498 510 520 555 629 663 664 680 740 780 830 884 888 962 996 1020 1079 1105 1110 1245 1258 1326 1411 1443 1480 1560 1660 1768 1887 1924 1992 2040 2158 2210 2220 2405 2490 2516 2652 2822 2886 3071 3145 3237 3315 3320 3774 3848 4233 4316 4420 4440 4810 4980 5032 5304 5395 5644 5772 6142 6290 6474 6630 7055 7215 7548 8177 8466 8632 8840 9213 9435 9620 9960 10790 11288 11544 12284 12580 12948 13260 14110 14430 15096 15355 16185 16354 16932 18343 18426 18870 19240 21165 21580 24531 24568 25160 25896 26520 28220 28860 30710 32370 32708 33864 36686 36852 37740 39923 40885 42330 43160 46065 49062 52207 55029 56440 57720 61420 64740 65416 73372 73704 75480 79846 81770 84660 91715 92130 98124 104414 110058 119769 122655 122840 129480 146744 156621 159692 163540 169320 183430 184260 196248 199615 208828 220116 239538 245310 261035 275145 313242 319384 327080 366860 368520 399230 417656 440232 479076 490620 522070 550290 598845 626484 678691 733720 783105 798460 958152 981240 1044140 1100580 1197690 1252968 1357382 1566210 1596920 2036073 2088280 2201160 2395380 2714764 3132420 3393455 4072146 4790760 5429528 6264840 6786910 8144292 10180365 13573820 16288584 20360730 27147640 40721460 81442920
- Sum of all divisors σ(n): 289578240
- Sum of proper divisors (its aliquot sum) s(n): 208135320
- 81442920 is an abundant number, because the sum of its proper divisors (208135320) is greater than itself. Its abundance is 126692400
Bases of 81442920
- Binary: 1001101101010111000011010002
- Hexadecimal: 0x4DAB868
- Base-36: 1CHLRC
Squares and roots of 81442920
- 81442920 squared (814429202) is 6632949218126400
- 81442920 cubed (814429203) is 540206752535930945088000
-
The
square root of 81442920 is 9024.5731200983 -
The
cube root of 81442920 is 433.4620814019
Scales and comparisons
How big is 81442920?- 81,442,920 seconds is equal to 2 years, 30 weeks, 4 days, 15 hours, 2 minutes.
-
To count from 1 to 81,442,920 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 81442920 cubic inches would be around 36.1 feet tall.
Recreational maths with 81442920
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