660587 has 4 divisors (see below), whose sum is σ = 662256. Its totient is φ = 658920.

The previous prime is 660563. The next prime is 660589. The reversal of 660587 is 785066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660587 - 2¹⁰ = 659563 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660587.

It is not an unprimeable number, because it can be changed into a prime (660589) 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, 137 + ... + 1157.

It is an arithmetic number, because the mean of its divisors is an integer number (165564).

2⁶⁶⁰⁵⁸⁷ is an apocalyptic number.

660587 is a deficient number, since it is larger than the sum of its proper divisors (1669).

660587 is a wasteful number, since it uses less digits than its factorization.

660587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 660587 is about 812.7650336967. The cubic root of 660587 is about 87.0916812176.

The spelling of 660587 in words is "six hundred sixty thousand, five hundred eighty-seven".