158

158 is an even composite number composed of two prime numbers multiplied together.

What does the number 158 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

158 is an even composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

Prime factorization of 158:

2 × 79

See below for interesting mathematical facts about the number 158 from the Numbermatics database.

Names of 158

• Cardinal: 158 can be written as One hundred fifty-eight.

Scientific notation

• Scientific notation: 1.58 × 102

Factors of 158

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 81

Divisors of 158

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 240
• Sum of proper divisors (its aliquot sum) s(n): 82
• 158 is a deficient number, because the sum of its proper divisors (82) is less than itself. Its deficiency is 76

Bases of 158

• Binary: 100111102
• Base-36: 4E

Squares and roots of 158

• 158 squared (1582) is 24964
• 158 cubed (1583) is 3944312
• The square root of 158 is 12.5698050899
• The cube root of 158 is 5.4061201757

Scales and comparisons

How big is 158?
• 158 seconds is equal to 2 minutes, 38 seconds.
• To count from 1 to 158 would take you about nineteen 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 158 cubic inches would be around 0.5 feet tall.

Recreational maths with 158

• 158 backwards is 851
• The number of decimal digits it has is: 3
• The sum of 158's digits is 14
• More coming soon!

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