2 added 23 characters in body
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JavaScript, 7189 chars

console.log('#' + ('00000' + eval('256*(256*(' + DEC.replace(/ /g, ')+')).toString(16)).slice(-6))

Converts 72 61 139 to 256*(256*(72)+61)+139 and evals it.

JavaScript, 71 chars

console.log('#' + eval('256*(256*(' + DEC.replace(/ /g, ')+')).toString(16))

Converts 72 61 139 to 256*(256*(72)+61)+139 and evals it.

JavaScript, 89 chars

console.log('#' + ('00000' + eval('256*(256*(' + DEC.replace(/ /g, ')+')).toString(16)).slice(-6))

Converts 72 61 139 to 256*(256*(72)+61)+139 and evals it.

1
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JavaScript, 71 chars

console.log('#' + eval('256*(256*(' + DEC.replace(/ /g, ')+')).toString(16))

Converts 72 61 139 to 256*(256*(72)+61)+139 and evals it.