646168 has 24 divisors (see below), whose sum is σ = 1266300. Its totient is φ = 309024.

The previous prime is 646159. The next prime is 646169. The reversal of 646168 is 861646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646169) by changing a digit.

646168 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 in 5 ways as a sum of consecutive naturals, for example, 10923 + ... + 10981.

2⁶⁴⁶¹⁶⁸ is an apocalyptic number.

It is an amenable number.

646168 is a deficient number, since it is larger than the sum of its proper divisors (620132).

646168 is a wasteful number, since it uses less digits than its factorization.

646168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 98 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 646168 is about 803.8457563488. The cubic root of 646168 is about 86.4533478263.

The spelling of 646168 in words is "six hundred forty-six thousand, one hundred sixty-eight".