623397600

Appears in sequences

• Numbers k for which sigma(k)/k - 4/7 is an integer.at n=13A218411
• Harmonic numbers m from A001599 such that m*(m-tau(m))/sigma(m) is an integer h, where k-tau(k) is the number of nondivisors of k (A049820), tau(k) is the number of divisors of k (A000005), and sigma(k) is the sum of the divisors of k (A000203).at n=23A325021
• Refactorable numbers (A033950) that are simultaneously arithmetic (A003601) and harmonic (A001599).at n=7A331666