In the following nuclear reaction,
D\buildrel \alpha \over
\longrightarrow {D_1}\buildrel {{\beta ^ - }} \over
\longrightarrow {D_2}\buildrel \alpha \over
\longrightarrow {D_3}\buildrel \gamma \over
\longrightarrow {D_4}
Mass number of D is 182 and atomic number is 74. Mass number and atomic number of D₄ respectively will be _________.