1. numeral
2. digit
3. number
4. figure
5. amount
6. digital (electronics etc)

classifier: 個

1. ecology (the study of interactions between organisms and their environment)
2. ecological state (the condition or health of a natural environment)
3. (fig.) ecosystem (a complex network, e.g. in tech, business or media, as in 数字生态 shùzìshēngtài "digital ecosystem")