70

Names of 70

• Cardinal: 70 can be written as Seventy.

Scientific notation

• Scientific notation: 7 × 10¹

Factors of 70

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 14

Divisors of 70

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 5 7 10 14 35 70
• Sum of all divisors σ(n): 144
• Sum of proper divisors (its aliquot sum) s(n): 74
• 70 is an abundant number, because the sum of its proper divisors (74) is greater than itself. Its abundance is 4

Bases of 70

• Binary: 1000110₂
• Hexadecimal: 0x46
• Base-36: 1Y

Squares and roots of 70

• 70 squared (70²) is 4900
• 70 cubed (70³) is 343000
• The square root of 70 is 8.3666002653
• The cube root of 70 is 4.1212852999

Scales and comparisons

• 70 seconds is equal to 1 minute, 10 seconds.
• To count from 1 to 70 would take you about thirty-five seconds.

  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 70 cubic inches would be around 0.3 feet tall.

Recreational maths with 70

• 70 backwards is 07
• 70 is a Harshad number.
• The number of decimal digits it has is: 2
• The sum of 70's digits is 7
• More coming soon!