643001332 has 12 divisors (see below), whose sum is σ = 1138810176. Its totient is φ = 317627000.

The previous prime is 643001291. The next prime is 643001339. The reversal of 643001332 is 233100346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643001339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 968044 + ... + 968707.

It is an arithmetic number, because the mean of its divisors is an integer number (94900848).

Almost surely, 2^643001332 is an apocalyptic number.

It is an amenable number.

643001332 is a deficient number, since it is larger than the sum of its proper divisors (495808844).

643001332 is a wasteful number, since it uses less digits than its factorization.

643001332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936838 (or 1936836 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 643001332 is about 25357.4709306745. The cubic root of 643001332 is about 863.1188952100.

Adding to 643001332 its reverse (233100346), we get a palindrome (876101678).

The spelling of 643001332 in words is "six hundred forty-three million, one thousand, three hundred thirty-two".