643168 has 24 divisors (see below), whose sum is σ = 1285200. Its totient is φ = 316800.

The previous prime is 643129. The next prime is 643183. The reversal of 643168 is 861346.

643168 is a modest number, since divided by 3168 gives 64 as remainder.

It is a congruent number.

It is an unprimeable number.

643168 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3133 + ... + 3331.

It is an arithmetic number, because the mean of its divisors is an integer number (53550).

2⁶⁴³¹⁶⁸ is an apocalyptic number.

It is an amenable number.

643168 is a deficient number, since it is larger than the sum of its proper divisors (642032).

643168 is a wasteful number, since it uses less digits than its factorization.

643168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 302 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 643168 is about 801.9775557957. The cubic root of 643168 is about 86.3193463160.

The spelling of 643168 in words is "six hundred forty-three thousand, one hundred sixty-eight".