Declension table of ?saptaviṃśatirātra

Neuter	Singular	Dual	Plural
Nominative	saptaviṃśatirātram	saptaviṃśatirātre	saptaviṃśatirātrāṇi
Vocative	saptaviṃśatirātra	saptaviṃśatirātre	saptaviṃśatirātrāṇi
Accusative	saptaviṃśatirātram	saptaviṃśatirātre	saptaviṃśatirātrāṇi
Instrumental	saptaviṃśatirātreṇa	saptaviṃśatirātrābhyām	saptaviṃśatirātraiḥ
Dative	saptaviṃśatirātrāya	saptaviṃśatirātrābhyām	saptaviṃśatirātrebhyaḥ
Ablative	saptaviṃśatirātrāt	saptaviṃśatirātrābhyām	saptaviṃśatirātrebhyaḥ
Genitive	saptaviṃśatirātrasya	saptaviṃśatirātrayoḥ	saptaviṃśatirātrāṇām
Locative	saptaviṃśatirātre	saptaviṃśatirātrayoḥ	saptaviṃśatirātreṣu

Compound saptaviṃśatirātra -

Adverb -saptaviṃśatirātram -saptaviṃśatirātrāt