643441252 has 24 divisors (see below), whose sum is σ = 1133207712. Its totient is φ = 319675200.

The previous prime is 643441247. The next prime is 643441291. The reversal of 643441252 is 252144346.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589227 + ... + 590317.

It is an arithmetic number, because the mean of its divisors is an integer number (47216988).

Almost surely, 2^643441252 is an apocalyptic number.

It is an amenable number.

643441252 is a deficient number, since it is larger than the sum of its proper divisors (489766460).

643441252 is a wasteful number, since it uses less digits than its factorization.

643441252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899 (or 1897 counting only the distinct ones).

The product of its digits is 23040, while the sum is 31.

The square root of 643441252 is about 25366.1438141472. The cubic root of 643441252 is about 863.3156893611.

Adding to 643441252 its reverse (252144346), we get a palindrome (895585598).

The spelling of 643441252 in words is "six hundred forty-three million, four hundred forty-one thousand, two hundred fifty-two".