671587 has 8 divisors (see below), whose sum is σ = 788576. Its totient is φ = 559872.

The previous prime is 671581. The next prime is 671591. The reversal of 671587 is 785176.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 8-Lehmer number, since φ(671587) divides (671587-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 671587 - 2¹⁵ = 638819 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 6.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1038 + ... + 1555.

It is an arithmetic number, because the mean of its divisors is an integer number (98572).

2⁶⁷¹⁵⁸⁷ is an apocalyptic number.

671587 is a deficient number, since it is larger than the sum of its proper divisors (116989).

671587 is a wasteful number, since it uses less digits than its factorization.

671587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637.

The product of its digits is 11760, while the sum is 34.

The square root of 671587 is about 819.5041183545. The cubic root of 671587 is about 87.5724352574.

The spelling of 671587 in words is "six hundred seventy-one thousand, five hundred eighty-seven".