728

728 = 2 × 2 × 2 × 7 × 13

728 = 1 × 2 + 34 + 5 + 678 + 9

728 = 9 × 8 × 7 + 6 + 5 × 43 + 2 + 1

728 = 0^7 − 1^9 + 2^5 − 3^8 + 4^6 + 5^2 + 6^1 + 7^4 + 8^0 + 9^3

\( {\displaystyle {\begin{matrix}\mathrm {Cabtaxi} (3)&=&728&=&6^{3}+8^{3}\\&&&=&9^{3}-1^{3}\\&&&=&12^{3}-10^{3}\end{matrix}}} \)

Number k such that k^64 + 1 is prime.

6 * n^2 + 2, n = 11

Factors: 1, 2, 4, 7, 8, 13, 14, 26, 28, 52, 56, 91, 104, 182, 364, 728

Seven hundred twenty-eight

Representations, Binary to Hexadecimal:

1011011000_2
222222_3
23120_4
10403_5
3212_6
2060_7
1330_8
888_9
602_11
508_12
440_13
3a0_14
338_15
2d8_16

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