640139920
640,139,920 is an even composite number composed of five prime numbers multiplied together.
640139920 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of one hundred twenty divisors.
Prime factorization of 640139920:
24 × 5 × 72 × 73 × 2237
(2 × 2 × 2 × 2 × 5 × 7 × 7 × 73 × 2237)See below for interesting mathematical facts about the number 640139920 from the Numbermatics database.
Names of 640139920
- Cardinal: 640139920 can be written as Six hundred forty million, one hundred thirty-nine thousand, nine hundred twenty.
Scientific notation
- Scientific notation: 6.4013992 × 108
Factors of 640139920
Divisors of 640139920
- Number of divisors d(n): 120
-
Complete list of divisors:
1 2 4 5 7 8 10 14 16 20 28 35 40 49 56 70 73 80 98 112 140 146 196 245 280 292 365 392 490 511 560 584 730 784 980 1022 1168 1460 1960 2044 2237 2555 2920 3577 3920 4088 4474 5110 5840 7154 8176 8948 10220 11185 14308 15659 17885 17896 20440 22370 28616 31318 35770 35792 40880 44740 57232 62636 71540 78295 89480 109613 125272 143080 156590 163301 178960 219226 250544 286160 313180 326602 438452 548065 626360 653204 816505 876904 1096130 1143107 1252720 1306408 1633010 1753808 2192260 2286214 2612816 3266020 4384520 4572428 5715535 6532040 8001749 8769040 9144856 11431070 13064080 16003498 18289712 22862140 32006996 40008745 45724280 64013992 80017490 91448560 128027984 160034980 320069960 640139920
- Sum of all divisors σ(n): 1755818424
- Sum of proper divisors (its aliquot sum) s(n): 1115678504
- 640139920 is an abundant number, because the sum of its proper divisors (1115678504) is greater than itself. Its abundance is 475538584
Bases of 640139920
- Binary: 1001100010011111000010100100002
- Hexadecimal: 0x2627C290
- Base-36: AL4F4G
Squares and roots of 640139920
- 640139920 squared (6401399202) is 409779117177606400
- 640139920 cubed (6401399203) is 262315971287743586687488000
-
The
square root of 640139920 is 25300.9865420303 -
The
cube root of 640139920 is 861.8366732077
Scales and comparisons
How big is 640139920?- 640,139,920 seconds is equal to 20 years, 18 weeks, 3 days, 38 minutes, 40 seconds.
-
To count from 1 to 640,139,920 would take you about thirty 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 640139920 cubic inches would be around 71.8 feet tall.
Recreational maths with 640139920
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