646568 has 16 divisors (see below), whose sum is σ = 1305780. Its totient is φ = 298368.

The previous prime is 646549. The next prime is 646571. The reversal of 646568 is 865646.

It can be written as a sum of positive squares in 2 ways, for example, as 643204 + 3364 = 802^2 + 58^2 .

It is an unprimeable number.

646568 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3005 + ... + 3212.

2⁶⁴⁶⁵⁶⁸ is an apocalyptic number.

It is an amenable number.

646568 is an abundant number, since it is smaller than the sum of its proper divisors (659212).

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

646568 is a wasteful number, since it uses less digits than its factorization.

646568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6236 (or 6232 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 646568 is about 804.0945218070. The cubic root of 646568 is about 86.4711833355.

The spelling of 646568 in words is "six hundred forty-six thousand, five hundred sixty-eight".