convert seconds to hh:mm:ss

I have the following value: 124582 seconds that I want to convert to hh:mms in my ssrs report.

Fields!Sec_Online.Value/3600 returns..  34.606111...  So I'm looking at over 24 hours..

I found another post that gets me close for anything under 24 hours.  When

=format(date.FromOAdate((Fields!Sec_Online.Value)/86400), "HH:mms")  This returns 10:36:22