text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_2676980_4 (participating_parties VARCHAR, registered_voters VARCHAR)
  ### Question:
  What is the number of participating parties when registered voters totaled 643629?
  ### Answer:
  SELECT COUNT(participating_parties) FROM table_2676980_4 WHERE registered_voters = 643629