List of numbers — Integers ← 1k 2k 3k 4k 5k 6k 7k 8k 9k →
Cardinal	One thousand, seven hundred [and] twenty-eight
Ordinal	1728th
Factorization
Roman numeral	MDCCXXVIII
Binary	11011000000
Octal	3300
Duodecimal	1000
Hexadecimal	6C0

1728 is the natural number following 1727 and preceding 1729. 1728 is a dozen gross, or one great gross.

[edit] In mathematics

It is the cube of 12 and, as such, is important in the duodecimal number system. 1728 occurs in the algebraic formula for the j-invariant of an elliptic curve. As a consequence, it is sometimes called a Zagier as a pun on the Gross–Zagier theorem.

• 1728 = 12³
• 1728 = 3³ × 4³
• 1728 = 2³ × 6³
• 1728 = 6³ + 8³ + 10³
• 1728 = 24² + 24² + 24²

17 = 2 + 3 + 5 + 7

28 = 2 + 3 + 5 + 7 + 11

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An alternate name for a "great gross" or "grand gross" is the Germanic word Maß^[1] (Pronounced "mass").

[edit] Notes

1. ^ http://de.wikipedia.org/wiki/Ma%C3%9F_(Mengenangabe)