671679 has 8 divisors (see below), whose sum is σ = 995120. Its totient is φ = 447768.

The previous prime is 671651. The next prime is 671681. The reversal of 671679 is 976176.

It is not a de Polignac number, because 671679 - 2⁵ = 671647 is a prime.

It is a Duffinian number.

671679 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671609) 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, 12412 + ... + 12465.

It is an arithmetic number, because the mean of its divisors is an integer number (124390).

2⁶⁷¹⁶⁷⁹ is an apocalyptic number.

671679 is a deficient number, since it is larger than the sum of its proper divisors (323441).

671679 is a wasteful number, since it uses less digits than its factorization.

671679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24886 (or 24880 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 671679 is about 819.5602479379. The cubic root of 671679 is about 87.5764338935.

It can be divided in two parts, 67167 and 9, that added together give a palindrome (67176).

The spelling of 671679 in words is "six hundred seventy-one thousand, six hundred seventy-nine".