👉 In mathematics, a birectangular number is a number that can be expressed as the sum of two or more consecutive positive integers. For example, 1234567890 is a birectangular number because it can be written as the sum of the first five positive integers. The term "birectangular" comes from the Latin word "bis", which means "two". In this context, "birectangular" refers to a number that can be divided by
