643064 has 16 divisors (see below), whose sum is σ = 1245120. Its totient is φ = 311040.

The previous prime is 643061. The next prime is 643073. The reversal of 643064 is 460346.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1049 + ... + 1544.

It is an arithmetic number, because the mean of its divisors is an integer number (77820).

2⁶⁴³⁰⁶⁴ is an apocalyptic number.

It is an amenable number.

643064 is a deficient number, since it is larger than the sum of its proper divisors (602056).

643064 is a wasteful number, since it uses less digits than its factorization.

643064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2630 (or 2626 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 643064 is about 801.9127134545. The cubic root of 643064 is about 86.3146934643.

The spelling of 643064 in words is "six hundred forty-three thousand, sixty-four".