643343532 has 24 divisors (see below), whose sum is σ = 1616607216. Its totient is φ = 197951808.

The previous prime is 643343513. The next prime is 643343543. The reversal of 643343532 is 235343346.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 643343493 and 643343502.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2061843 + ... + 2062154.

It is an arithmetic number, because the mean of its divisors is an integer number (67358634).

Almost surely, 2^643343532 is an apocalyptic number.

It is an amenable number.

643343532 is an abundant number, since it is smaller than the sum of its proper divisors (973263684).

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

643343532 is a wasteful number, since it uses less digits than its factorization.

643343532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124017 (or 4124015 counting only the distinct ones).

The product of its digits is 77760, while the sum is 33.

The square root of 643343532 is about 25364.2175515035. The cubic root of 643343532 is about 863.2719829725.

Adding to 643343532 its reverse (235343346), we get a palindrome (878686878).

The spelling of 643343532 in words is "six hundred forty-three million, three hundred forty-three thousand, five hundred thirty-two".