The BIGINT data type is used to represent big integers. The value range is available from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.
If you specify 8934 as BIGINT, 8934 is stored.
If you specify 89.1 as BIGINT, 89 is stored.
If you specify 89.8 as BIGINT, 90 is stored (all digits after the decimal point are rounded).
If you specify 3458901122 as BIGINT, 3458901122 is stored.