671768 has 16 divisors (see below), whose sum is σ = 1271160. Its totient is φ = 332800.

The previous prime is 671753. The next prime is 671777. The reversal of 671768 is 867176.

It is a congruent number.

It is an unprimeable number.

671768 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 728 + ... + 1368.

2⁶⁷¹⁷⁶⁸ is an apocalyptic number.

It is an amenable number.

671768 is a deficient number, since it is larger than the sum of its proper divisors (599392).

671768 is a wasteful number, since it uses less digits than its factorization.

671768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 774 counting only the distinct ones).

The product of its digits is 14112, while the sum is 35.

The square root of 671768 is about 819.6145435508. The cubic root of 671768 is about 87.5803017919.

The spelling of 671768 in words is "six hundred seventy-one thousand, seven hundred sixty-eight".