66487 has 4 divisors (see below), whose sum is σ = 70416. Its totient is φ = 62560.

The previous prime is 66467. The next prime is 66491. The reversal of 66487 is 78466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78466 = 2 ⋅39233.

It is not a de Polignac number, because 66487 - 2⁷ = 66359 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6³ + 6³ + 4⁸ + 8³ + 7 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1939 + ... + 1972.

It is an arithmetic number, because the mean of its divisors is an integer number (17604).

2⁶⁶⁴⁸⁷ is an apocalyptic number.

66487 is a deficient number, since it is larger than the sum of its proper divisors (3929).

66487 is a wasteful number, since it uses less digits than its factorization.

66487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3928.

The product of its digits is 8064, while the sum is 31.

The square root of 66487 is about 257.8507320137. The cubic root of 66487 is about 40.5115549004.

The spelling of 66487 in words is "sixty-six thousand, four hundred eighty-seven".