671787 has 16 divisors (see below), whose sum is σ = 1008000. Its totient is φ = 442152.

The previous prime is 671779. The next prime is 671791. The reversal of 671787 is 787176.

It is not a de Polignac number, because 671787 - 2³ = 671779 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 671787.

It is not an unprimeable number, because it can be changed into a prime (671717) 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 15 ways as a sum of consecutive naturals, for example, 3664 + ... + 3842.

It is an arithmetic number, because the mean of its divisors is an integer number (63000).

2⁶⁷¹⁷⁸⁷ is an apocalyptic number.

671787 is a deficient number, since it is larger than the sum of its proper divisors (336213).

671787 is a wasteful number, since it uses less digits than its factorization.

671787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 321 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 671787 is about 819.6261342832. The cubic root of 671787 is about 87.5811274788.

The spelling of 671787 in words is "six hundred seventy-one thousand, seven hundred eighty-seven".