$\large {011111100011_2 = 3743_8 = 7E3_{16} = abcd_{10} }$

Find $a \times b \times c \times d$ ?

The answer is 0.

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$\begin{array} {lc} \text{Base 2 }\to \text{ base 8:} & \underbrace{011}_3 \underbrace{111}_7 \underbrace{100}_4 \underbrace{011}_3 \\ \text{Base 2 }\to \text{ base 16:} & \underbrace{0111}_7 \ \underbrace{1110}_E \ \underbrace{0011}_3 \\ \text{Base 16 }\to \text{ base 10:} & \overbrace{7 \times 16^2}^7 + \overbrace{14\times 16^1}^E + \overbrace{3\times 16^0}^3 & = 2019_{10} \end{array}$

Therefore $a\times b \times c \times d = 2 \times 0 \times 1 \times 9 = \boxed 0$ .