671964 has 12 divisors (see below), whose sum is σ = 1567944. Its totient is φ = 223984.

The previous prime is 671947. The next prime is 671969. The reversal of 671964 is 469176.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27987 + ... + 28010.

It is an arithmetic number, because the mean of its divisors is an integer number (130662).

2⁶⁷¹⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

671964 is an abundant number, since it is smaller than the sum of its proper divisors (895980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671964 is a wasteful number, since it uses less digits than its factorization.

671964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56004 (or 56002 counting only the distinct ones).

The product of its digits is 9072, while the sum is 33.

The square root of 671964 is about 819.7341032310. The cubic root of 671964 is about 87.5888186558.

The spelling of 671964 in words is "six hundred seventy-one thousand, nine hundred sixty-four".