2. Multiply each bit by its corresponding power of 2 and add all the terms up.
110 1101 1011 0011 1111 0001(2) =
(1 × 222 + 1 × 221 + 0 × 220 + 1 × 219 + 1 × 218 + 0 × 217 + 1 × 216 + 1 × 215 + 0 × 214 + 1 × 213 + 1 × 212 + 0 × 211 + 0 × 210 + 1 × 29 + 1 × 28 + 1 × 27 + 1 × 26 + 1 × 25 + 1 × 24 + 0 × 23 + 0 × 22 + 0 × 21 + 1 × 20)(10) =
(4 194 304 + 2 097 152 + 0 + 524 288 + 262 144 + 0 + 65 536 + 32 768 + 0 + 8 192 + 4 096 + 0 + 0 + 512 + 256 + 128 + 64 + 32 + 16 + 0 + 0 + 0 + 1)(10) =
(4 194 304 + 2 097 152 + 524 288 + 262 144 + 65 536 + 32 768 + 8 192 + 4 096 + 512 + 256 + 128 + 64 + 32 + 16 + 1)(10) =
7 189 489(10)
The number 110 1101 1011 0011 1111 0001(2) converted from an unsigned binary (in base 2) and written as a positive integer (with no sign) in decimal system (in base ten):
110 1101 1011 0011 1111 0001(2) = 7 189 489(10)
Spaces were used to group digits: for binary, by 4, for decimal, by 3.