671798 has 8 divisors (see below), whose sum is σ = 1012392. Its totient is φ = 334336.

The previous prime is 671791. The next prime is 671831. The reversal of 671798 is 897176.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671791) 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 3 ways as a sum of consecutive naturals, for example, 140 + ... + 1167.

It is an arithmetic number, because the mean of its divisors is an integer number (126549).

2⁶⁷¹⁷⁹⁸ is an apocalyptic number.

671798 is a deficient number, since it is larger than the sum of its proper divisors (340594).

671798 is a wasteful number, since it uses less digits than its factorization.

671798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566.

The product of its digits is 21168, while the sum is 38.

The square root of 671798 is about 819.6328446323. The cubic root of 671798 is about 87.5816055009.

The spelling of 671798 in words is "six hundred seventy-one thousand, seven hundred ninety-eight".