81730220
81,730,220 is an even composite number composed of six prime numbers multiplied together.
81730220 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of one hundred forty-four divisors.
Prime factorization of 81730220:
22 × 5 × 11 × 13 × 17 × 412
(2 × 2 × 5 × 11 × 13 × 17 × 41 × 41)See below for interesting mathematical facts about the number 81730220 from the Numbermatics database.
Names of 81730220
- Cardinal: 81730220 can be written as Eighty-one million, seven hundred thirty thousand, two hundred twenty.
Scientific notation
- Scientific notation: 8.173022 × 107
Factors of 81730220
Divisors of 81730220
- Number of divisors d(n): 144
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Complete list of divisors:
1 2 4 5 10 11 13 17 20 22 26 34 41 44 52 55 65 68 82 85 110 130 143 164 170 187 205 220 221 260 286 340 374 410 442 451 533 572 697 715 748 820 884 902 935 1066 1105 1394 1430 1681 1804 1870 2132 2210 2255 2431 2665 2788 2860 3362 3485 3740 4420 4510 4862 5330 5863 6724 6970 7667 8405 9020 9061 9724 10660 11726 12155 13940 15334 16810 18122 18491 21853 23452 24310 28577 29315 30668 33620 36244 36982 38335 43706 45305 48620 57154 58630 73964 76670 87412 90610 92455 99671 109265 114308 117260 142885 153340 181220 184910 199342 218530 240383 285770 314347 369820 371501 398684 437060 480766 498355 571540 628694 743002 961532 996710 1201915 1257388 1486004 1571735 1857505 1993420 2403830 3143470 3715010 4086511 4807660 6286940 7430020 8173022 16346044 20432555 40865110 81730220
- Sum of all divisors σ(n): 218834784
- Sum of proper divisors (its aliquot sum) s(n): 137104564
- 81730220 is an abundant number, because the sum of its proper divisors (137104564) is greater than itself. Its abundance is 55374344
Bases of 81730220
- Binary: 1001101111100011010101011002
- Hexadecimal: 0x4DF1AAC
- Base-36: 1CNRFW
Squares and roots of 81730220
- 81730220 squared (817302202) is 6679828861248400
- 81730220 cubed (817302203) is 545943882392181206648000
-
The
square root of 81730220 is 9040.4767573397 -
The
cube root of 81730220 is 433.9711803157
Scales and comparisons
How big is 81730220?- 81,730,220 seconds is equal to 2 years, 31 weeks, 22 hours, 50 minutes, 20 seconds.
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To count from 1 to 81,730,220 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 81730220 cubic inches would be around 36.2 feet tall.
Recreational maths with 81730220
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