644399440020

Names of 644399440020

• Cardinal: 644399440020 can be written as Six hundred forty-four billion, three hundred ninety-nine million, four hundred forty thousand and twenty.

Scientific notation

• Scientific notation: 6.4439944002 × 10¹¹

Factors of 644399440020

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 31147

Divisors of 644399440020

• Number of divisors d(n): 216
• Complete list of divisors:
  1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 28 30 35 36 42 45 49 60 63 70 84 90 98 105 126 140 147 180 196 210 245 252 294 315 420 441 490 588 630 735 882 980 1260 1470 1764 2205 2557 2940 4410 5114 7671 8820 10228 12785 15342 17899 23013 25570 28573 30684 35798 38355 46026 51140 53697 57146 71596 76710 85719 89495 92052 107394 114292 115065 125293 142865 153420 161091 171438 178990 200011 214788 230130 250586 257157 268485 285730 322182 342876 357980 375879 400022 428595 460260 501172 514314 536970 571460 600033 626465 644364 751758 800044 805455 857190 1000055 1028628 1073940 1127637 1200066 1252930 1285785 1400077 1503516 1610910 1714380 1800099 1879395 2000110 2255274 2400132 2505860 2571570 2800154 3000165 3221820 3600198 3758790 4000220 4200231 4510548 5143140 5600308 5638185 6000330 7000385 7200396 7517580 8400462 9000495 11276370 12000660 12600693 14000770 16800924 18000990 21001155 22552740 25201386 28001540 36001980 42002310 50402772 63003465 73061161 84004620 126006930 146122322 219183483 252013860 292244644 365305805 438366966 511428127 657550449 730611610 876733932 1022856254 1095917415 1315100898 1461223220 1534284381 2045712508 2191834830 2557140635 2630201796 3068568762 3287752245 3579996889 4383669660 4602853143 5114281270 6137137524 6575504490 7159993778 7671421905 9205706286 10228562540 10739990667 13151008980 14319987556 15342843810 17899984445 18411412572 21479981334 23014265715 30685687620 32219972001 35799968890 42959962668 46028531430 53699953335 64439944002 71599937780 92057062860 107399906670 128879888004 161099860005 214799813340 322199720010 644399440020
• Sum of all divisors σ(n): 2274778311624
• Sum of proper divisors (its aliquot sum) s(n): 1630378871604
• 644399440020 is an abundant number, because the sum of its proper divisors (1630378871604) is greater than itself. Its abundance is 985979431584

Bases of 644399440020

• Binary: 1001011000001001001100110010000010010100₂
• Hexadecimal: 0x9609332094
• Base-36: 8816SE50

Squares and roots of 644399440020

• 644399440020 squared (644399440020²) is 415250638298089577600400
• 644399440020 cubed (644399440020³) is 267587278787236489641496095328008000
• The square root of 644399440020 is 802744.9408249173
• The cube root of 644399440020 is 8637.4401568049

Scales and comparisons

• 644,399,440,020 seconds is equal to 20,489 years, 47 weeks, 1 day, 20 hours, 27 minutes.
• To count from 1 to 644,399,440,020 would take you about forty thousand, nine hundred seventy-nine 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 644399440020 cubic inches would be around 719.8 feet tall.

Recreational maths with 644399440020

• 644399440020 backwards is 020044993446
• 644399440020 is a Harshad number.
• The number of decimal digits it has is: 12
• The sum of 644399440020's digits is 45
• More coming soon!