643534052 has 18 divisors (see below), whose sum is σ = 1310051862. Its totient is φ = 275800224.

The previous prime is 643534049. The next prime is 643534057. The reversal of 643534052 is 250435346.

643534052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 524593216 + 118940836 = 22904^2 + 10906^2 .

It is not an unprimeable number, because it can be changed into a prime (643534057) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1641473 + ... + 1641864.

It is an arithmetic number, because the mean of its divisors is an integer number (72780659).

Almost surely, 2^643534052 is an apocalyptic number.

It is an amenable number.

643534052 is an abundant number, since it is smaller than the sum of its proper divisors (666517810).

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

643534052 is a wasteful number, since it uses less digits than its factorization.

643534052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3283355 (or 3283346 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 32.

The square root of 643534052 is about 25367.9729580430. The cubic root of 643534052 is about 863.3571911271.

Adding to 643534052 its reverse (250435346), we get a palindrome (893969398).

The spelling of 643534052 in words is "six hundred forty-three million, five hundred thirty-four thousand, fifty-two".