48

Number
$48$ (forty-eight) is:


 * $2^4 \times 3$


 * The $8$th superabundant number after $1, 2, 4, 6, 12, 24, 36$:
 * $\dfrac {\sigma \left({48}\right)} {48} = \dfrac {124} {48} = 2 \cdotp 58 \dot 3$


 * The $11$th semiperfect number after $6, 12, 18, 20, 24, 28, 30, 36, 40, 42$:
 * $48 = 8 + 16 + 24$


 * The $16$th Ulam number after $1, 2, 3, 4, 6, 8, 11, 13, 16, 18, 26, 28, 36, 38, 47$:
 * $48 = 1 + 47$


 * The $2$nd of the largest known pair of Ulam numbers which differ by $1$:
 * $47 = 11 + 36, \ 48 = 1 + 47$