81371640
81,371,640 is an even composite number composed of six prime numbers multiplied together.
81371640 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of one hundred twenty-eight divisors.
Prime factorization of 81371640:
23 × 3 × 5 × 7 × 73 × 1327
(2 × 2 × 2 × 3 × 5 × 7 × 73 × 1327)See below for interesting mathematical facts about the number 81371640 from the Numbermatics database.
Names of 81371640
- Cardinal: 81371640 can be written as Eighty-one million, three hundred seventy-one thousand, six hundred forty.
Scientific notation
- Scientific notation: 8.137164 × 107
Factors of 81371640
Divisors of 81371640
- Number of divisors d(n): 128
-
Complete list of divisors:
1 2 3 4 5 6 7 8 10 12 14 15 20 21 24 28 30 35 40 42 56 60 70 73 84 105 120 140 146 168 210 219 280 292 365 420 438 511 584 730 840 876 1022 1095 1327 1460 1533 1752 2044 2190 2555 2654 2920 3066 3981 4088 4380 5110 5308 6132 6635 7665 7962 8760 9289 10220 10616 12264 13270 15330 15924 18578 19905 20440 26540 27867 30660 31848 37156 39810 46445 53080 55734 61320 74312 79620 92890 96871 111468 139335 159240 185780 193742 222936 278670 290613 371560 387484 484355 557340 581226 678097 774968 968710 1114680 1162452 1356194 1453065 1937420 2034291 2324904 2712388 2906130 3390485 3874840 4068582 5424776 5812260 6780970 8137164 10171455 11624520 13561940 16274328 20342910 27123880 40685820 81371640
- Sum of all divisors σ(n): 283023360
- Sum of proper divisors (its aliquot sum) s(n): 201651720
- 81371640 is an abundant number, because the sum of its proper divisors (201651720) is greater than itself. Its abundance is 120280080
Bases of 81371640
- Binary: 1001101100110100001111110002
- Hexadecimal: 0x4D9A1F8
- Base-36: 1CG2RC
Squares and roots of 81371640
- 81371640 squared (813716402) is 6621343796289600
- 81371640 cubed (813716403) is 538789603707910666944000
-
The
square root of 81371640 is 9020.6230383495 -
The
cube root of 81371640 is 433.3355871021
Scales and comparisons
How big is 81371640?- 81,371,640 seconds is equal to 2 years, 30 weeks, 3 days, 19 hours, 14 minutes.
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To count from 1 to 81,371,640 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 81371640 cubic inches would be around 36.1 feet tall.
Recreational maths with 81371640
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