671312 has 10 divisors (see below), whose sum is σ = 1300698. Its totient is φ = 335648.

The previous prime is 671303. The next prime is 671323. The reversal of 671312 is 213176.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 583696 + 87616 = 764^2 + 296^2 .

It is a congruent number.

It is an unprimeable number.

671312 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20963 + ... + 20994.

2⁶⁷¹³¹² is an apocalyptic number.

It is an amenable number.

671312 is a deficient number, since it is larger than the sum of its proper divisors (629386).

671312 is a wasteful number, since it uses less digits than its factorization.

671312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41965 (or 41959 counting only the distinct ones).

The product of its digits is 252, while the sum is 20.

The square root of 671312 is about 819.3363167833. The cubic root of 671312 is about 87.5604806347.

Adding to 671312 its reverse (213176), we get a palindrome (884488).

The spelling of 671312 in words is "six hundred seventy-one thousand, three hundred twelve".