What's the values for the Freq_Interval column in MSDB.dbo.SysSchedules when Freq_Type is weekly and more than one day is selected in the schedule?
The documentation states

freq_interval is one or more of the following:
1 = Sunday 
2 = Monday 
4 = Tuesday 
8 = Wednesday 
16 = Thursday 
32 = Friday 
64 = Saturday

These values are all powers of 2.
When you select multiple days simply add the distinct codes.
2 + 4 + 8 + 16 + 32 = 62

or alternatively use the bitwise or operator to combine them.
2 | 4 | 8 | 16 | 32

(my recommendation would be to use | in code and + if adding them up in your head! - | is the &quot;correct&quot; thing to use and won't behave incorrectly if you have duplicate values in the list)
If you are trying to do the reverse operation you need bitwise and
DECLARE @Sunday TINYINT = 1,
        @Monday TINYINT = 2,
        @Tuesday TINYINT = 4,
        @Wednesday TINYINT = 8,
        @Thursday TINYINT = 16,
        @Friday TINYINT = 32,
        @Saturday TINYINT = 64;

DECLARE @TestValue TINYINT = 62;

SELECT CASE WHEN @TestValue &amp; @Sunday = @Sunday THEN 'Y' ELSE 'N' END AS Sunday,
       CASE WHEN @TestValue &amp; @Monday = @Monday THEN 'Y' ELSE 'N' END AS Monday,
       CASE WHEN @TestValue &amp; @Tuesday = @Tuesday THEN 'Y' ELSE 'N' END AS Tuesday,
       CASE WHEN @TestValue &amp; @Wednesday = @Wednesday THEN 'Y' ELSE 'N' END AS Wednesday,
       CASE WHEN @TestValue &amp; @Thursday = @Thursday THEN 'Y' ELSE 'N' END AS Thursday,
       CASE WHEN @TestValue &amp; @Friday = @Friday THEN 'Y' ELSE 'N' END AS Friday,
       CASE WHEN @TestValue &amp; @Saturday = @Saturday THEN 'Y' ELSE 'N' END AS Saturday