Determine Superabundance
Jelly, 7 bytes
Æs÷$ÞṪ=

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Jelly, 8 bytes
Æs÷$ÐṀ⁼W

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Explanation

Æs÷$ÐṀ⁼W ~ Full program (monadic).

    ÐṀ   ~ Keep the elements with maximal link value (auto-rangifies).
Æs       ~ Divisor sum.
  ÷$     ~ Divide by the current element.
      ⁼W ~ Check equality with the input wrapped into a singleton.
         ~ (for integers like 360360)