664587 has 36 divisors (see below), whose sum is σ = 1227096. Its totient is φ = 342720.

The previous prime is 664583. The next prime is 664589. The reversal of 664587 is 785466.

It is a happy number.

664587 is a `hidden beast` number, since 6 + 645 + 8 + 7 = 666.

It is not a de Polignac number, because 664587 - 2² = 664583 is a prime.

Its product of digits (40320) is a multiple of the sum of its prime factors (168).

664587 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (664583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4783 + ... + 4919.

It is an arithmetic number, because the mean of its divisors is an integer number (34086).

2⁶⁶⁴⁵⁸⁷ is an apocalyptic number.

664587 is a deficient number, since it is larger than the sum of its proper divisors (562509).

664587 is a wasteful number, since it uses less digits than its factorization.

664587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 158 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 664587 is about 815.2220556388. Note that the first 3 decimals coincide. The cubic root of 664587 is about 87.2671140448.

The spelling of 664587 in words is "six hundred sixty-four thousand, five hundred eighty-seven".