628318530717958647692

628318530717958647692 is a 21-digit integer associated with the mathematical constant 2π (tau). It represents the value obtained when the decimal point of 2π is removed after twenty places, effectively equal to floor(2π × 10^20).

In numerical form, 2π is approximately 6.28318530717958647692… If the decimal expansion is written without the point and the first twenty digits after the decimal are kept, the resulting integer is 628318530717958647692. Equivalently, the number can be described as floor(2π × 10^20). The sequence encodes the initial segment of 2π’s digits, but it has no mathematical significance beyond fixed-point representation of a portion of the constant.

As a fixed-point representation, this kind of truncation is sometimes used in computer arithmetic, pedagogy, or digit-extraction demonstrations to illustrate how constants like π or τ can be expressed numerically without a decimal point. It does not denote a special constant or property in itself, aside from being the integer form of a portion of 2π’s decimal expansion.

Related topics include the constants π and τ (tau), the relationship τ = 2π, and general practices of fixed-point numeric representation and digit extraction in computational contexts.