643068 has 18 divisors (see below), whose sum is σ = 1625624. Its totient is φ = 214344.

The previous prime is 643061. The next prime is 643073. The reversal of 643068 is 860346.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643068.

It is not an unprimeable number, because it can be changed into a prime (643061) by changing a digit.

643068 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, 8896 + ... + 8967.

2⁶⁴³⁰⁶⁸ is an apocalyptic number.

It is an amenable number.

643068 is an abundant number, since it is smaller than the sum of its proper divisors (982556).

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

643068 is a wasteful number, since it uses less digits than its factorization.

643068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17873 (or 17868 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 643068 is about 801.9152074877. The cubic root of 643068 is about 86.3148724294.

The spelling of 643068 in words is "six hundred forty-three thousand, sixty-eight".