tatra saṅkhyā ekatvabahutvādi / tathā hi dravyamekasaṅkhyāyuktam paryāyās tu sukhādayonekasaṅkhyāviśiṣṭāḥ
Here, number [means] singularity, plurality, etc.; for substance is connected with singularity while modes like pleasure etc. are characterized by plurality.