645140400

Names of 645140400

• Cardinal: 645140400 can be written as Six hundred forty-five million, one hundred forty thousand, four hundred.

Scientific notation

• Scientific notation: 6.451404 × 10⁸

Factors of 645140400

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 1708

Divisors of 645140400

• Number of divisors d(n): 120
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 15 16 20 24 25 30 40 48 50 60 75 80 100 120 150 200 240 300 400 421 600 842 1200 1263 1277 1684 2105 2526 2554 3368 3831 4210 5052 5108 6315 6385 6736 7662 8420 10104 10216 10525 12630 12770 15324 16840 19155 20208 20432 21050 25260 25540 30648 31575 31925 33680 38310 42100 50520 51080 61296 63150 63850 76620 84200 95775 101040 102160 126300 127700 153240 168400 191550 252600 255400 306480 383100 505200 510800 537617 766200 1075234 1532400 1612851 2150468 2688085 3225702 4300936 5376170 6451404 8064255 8601872 10752340 12902808 13440425 16128510 21504680 25805616 26880850 32257020 40321275 43009360 53761700 64514040 80642550 107523400 129028080 161285100 215046800 322570200 645140400
• Sum of all divisors σ(n): 2073130704
• Sum of proper divisors (its aliquot sum) s(n): 1427990304
• 645140400 is an abundant number, because the sum of its proper divisors (1427990304) is greater than itself. Its abundance is 782849904

Bases of 645140400

• Binary: 100110011101000000111110110000₂
• Hexadecimal: 0x26740FB0
• Base-36: AO3LIO

Squares and roots of 645140400

• 645140400 squared (645140400²) is 416206135712160000
• 645140400 cubed (645140400³) is 268511392875797187264000000
• The square root of 645140400 is 25399.6141702979
• The cube root of 645140400 is 864.0749463451

Scales and comparisons

• 645,140,400 seconds is equal to 20 years, 26 weeks, 4 days, 21 hours, 40 minutes.
• To count from 1 to 645,140,400 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 645140400 cubic inches would be around 72 feet tall.

Recreational maths with 645140400

• 645140400 backwards is 004041546
• 645140400 is a Harshad number.
• The number of decimal digits it has is: 9
• The sum of 645140400's digits is 24
• More coming soon!