10
The number 10 (ten) is the basis for the Decimal system of notation. In this system, each ``decimal place''consists of a Digit 0-9 arranged such that each Digit is multiplied by a Power of 10, decreasingfrom left to right, and with a decimal place indicating the 
s place. For example, the number 1234.56 specifies
The decimal places to the left of the decimal point are 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, ...(Sloane's A011557), called one, ten, Hundred, Thousand, ten thousand, hundred thousand, Million, 10 million,100 million, and so on. The names of subsequent decimal places for Large Numbers differ depending oncountry.
Any Power of 10 which can be written as the Product of two numbers not containing 0s must be of the form
for 
an Integer such that neither 
nor 
contains any Zeros.The largest known such number is
A complete list of known such numbers is
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(Madachy 1979). Since all Powers of 2 with exponents
contain at leastone Zero (Cook), no other Power of ten less than 46 million can be written as the Productof two numbers not containing 0s.See also Billion, Decimal, Hundred, Large Number, Milliard, Million,Thousand, Trillion, Zero
References
Madachy, J. S. Madachy's Mathematical Recreations. New York: Dover, pp. 127-128, 1979. Pickover, C. A. Keys to Infinity. New York: Wiley, p. 135, 1995. Sloane, N. J. A. Sequence A011557in ``The On-Line Version of the Encyclopedia of Integer Sequences.''http://www.research.att.com/~njas/sequences/eisonline.html.
- Jacobi Identities
- Jacobi Matrix
- Jacobi Method
- Jacobi Polynomial
- Jacobi Quadrature
- Jacobi Rotation Matrix
- Jacobi's Curvature Theorem
- Jacobi's Determinant Identity
- Jacobi's Imaginary Transformation
- Jacobi's Theorem
- Jacobi Symbol
- Jacobi Tensor
- Jacobi Theta Function
- Jacobi Transformation
- Jacobi Triple Product
- Jacobi Zeta Function
- Jacobsthal-Lucas Number
- Jacobsthal-Lucas Polynomial
- Jacobsthal Number
- Jacobsthal Polynomial
- Jaco-Shalen-Johannson Torus Decomposition
- Janko Groups
- Japanese Triangulation Theorem
- Jarnick's Inequality
- j-Conductor