643004 has 6 divisors (see below), whose sum is σ = 1125264. Its totient is φ = 321500.

The previous prime is 642997. The next prime is 643009. The reversal of 643004 is 400346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643009) 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 as a sum of consecutive naturals, namely, 80372 + ... + 80379.

It is an arithmetic number, because the mean of its divisors is an integer number (187544).

2⁶⁴³⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

643004 is a deficient number, since it is larger than the sum of its proper divisors (482260).

643004 is a wasteful number, since it uses less digits than its factorization.

643004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160755 (or 160753 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 643004 is about 801.8753020264. The cubic root of 643004 is about 86.3120088986.

The spelling of 643004 in words is "six hundred forty-three thousand, four".