BRASILIA, April 27 (Reuters) - Brazil's public debt dropped in March from the previous month as net bond redemptions offset an increase in interest payments, Treasury data showed on Monday.

Public debt fell 2.34% from February to 8.633 trillion reais ($1.73 trillion), the Treasury reported.

Net debt redemptions totaled 305.4 billion reais in March, while interest payments reached 98.1 billion reais.

The average cost of domestic public debt issuance, measured on a rolling 12-month basis, increased to 13.92% from 13.76% in February.

In Brazil, domestic public debt denominated in reais accounts for 96.2% of the total outstanding stock.

($1 = 4.9760 reais)

(Reporting by Isabel Versiani; Additional reporting and writing by Fernando Cardoso; Editing by Gabriel Araujo)