643006652 has 12 divisors (see below), whose sum is σ = 1125620160. Its totient is φ = 321400896.

The previous prime is 643006627. The next prime is 643006667. The reversal of 643006652 is 256600346.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 10493 + ... + 37364.

It is an arithmetic number, because the mean of its divisors is an integer number (93801680).

Almost surely, 2^643006652 is an apocalyptic number.

It is an amenable number.

643006652 is a deficient number, since it is larger than the sum of its proper divisors (482613508).

643006652 is a wasteful number, since it uses less digits than its factorization.

643006652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51220 (or 51218 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 643006652 is about 25357.5758305087. The cubic root of 643006652 is about 863.1212755990.

Adding to 643006652 its reverse (256600346), we get a palindrome (899606998).

The spelling of 643006652 in words is "six hundred forty-three million, six thousand, six hundred fifty-two".