58 (number)
From Halbeeg, the open encyclopedia · Af-Soomaali
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58 is a natural number that follows 57 and precedes 59. It is an even number, as it is divisible by two with no remainder. In the Roman numeral system it is written LVIII.
In number theory, 58 is a composite number, meaning it has divisors other than 1 and itself. It also serves as a symbol or designation in various fields, such as the periodic table of chemical elements.
Mathematical properties
58 can be factored as 2 × 29. Both of these are prime numbers, so 58 is called a semiprime—a number produced by the multiplication of two primes. Its divisors are 1, 2, 29, and 58. The sum of its divisors other than itself is 1 + 2 + 29 = 32, which is less than 58; therefore 58 is a deficient number.
One notable property is that 58 equals the sum of the first seven prime numbers: 2 + 3 + 5 + 7 + 11 + 13 + 17 = 58. In binary notation, 58 is written as 111010.
Language and notation
In Somali it is pronounced "konton iyo siddeed" (fifty and three). This additive pattern—tens and units—follows the general system of Somali numerals from twenty onward.
As a symbol
In the periodic table of elements, atomic number 58 designates cerium (Ce), one of the lanthanides. Additionally, 58 appears in various numbering systems and codes as a symbol without particular mathematical significance.