671764 has 12 divisors (see below), whose sum is σ = 1237600. Its totient is φ = 318168.

The previous prime is 671753. The next prime is 671777. The reversal of 671764 is 467176.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4344 + ... + 4495.

2⁶⁷¹⁷⁶⁴ is an apocalyptic number.

It is an amenable number.

671764 is a deficient number, since it is larger than the sum of its proper divisors (565836).

671764 is a wasteful number, since it uses less digits than its factorization.

671764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8862 (or 8860 counting only the distinct ones).

The product of its digits is 7056, while the sum is 31.

The square root of 671764 is about 819.6121033757. The cubic root of 671764 is about 87.5801279611.

The spelling of 671764 in words is "six hundred seventy-one thousand, seven hundred sixty-four".