684 = 1 + 23 + 4 + 567 + 89
684 = 9 + 8 + 7 + 654 + 3 + 2 + 1
684 = 0^4 + 1^6 + 2^8 − 3^9 + 4^7 + 5^5 + 6^0 + 7^1 + 8^3 + 9^2
Number k such that sigma(x) = k has exactly 7 solutions.
Factors: 1, 2, 3, 4, 6, 9, 12, 18, 19, 36, 38, 57, 76, 114, 171, 228, 342, 684
Representations, Binary to Hexadecimal:
1010101100_2
221100_3
22230_4
10214_5
3100_6
1665_7
1254_8
840_9
572_11
490_12
408_13
36c_14
309_15
2ac_16
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Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
