643434002 has 4 divisors (see below), whose sum is σ = 965151006. Its totient is φ = 321717000.

The previous prime is 643433977. The next prime is 643434017. The reversal of 643434002 is 200434346.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 588984361 + 54449641 = 24269^2 + 7379^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160858499 + ... + 160858502.

Almost surely, 2^643434002 is an apocalyptic number.

643434002 is a deficient number, since it is larger than the sum of its proper divisors (321717004).

643434002 is a wasteful number, since it uses less digits than its factorization.

643434002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321717003.

The product of its (nonzero) digits is 6912, while the sum is 26.

The square root of 643434002 is about 25366.0009067255. Note that the first 3 decimals coincide. The cubic root of 643434002 is about 863.3124468676.

Adding to 643434002 its reverse (200434346), we get a palindrome (843868348).

The spelling of 643434002 in words is "six hundred forty-three million, four hundred thirty-four thousand, two".