643868602 has 8 divisors (see below), whose sum is σ = 1040095476. Its totient is φ = 297170112.

The previous prime is 643868581. The next prime is 643868611. The reversal of 643868602 is 206868346.

643868602 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 2 ways, for example, as 500372161 + 143496441 = 22369^2 + 11979^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12382063 + ... + 12382114.

Almost surely, 2^643868602 is an apocalyptic number.

643868602 is a deficient number, since it is larger than the sum of its proper divisors (396226874).

643868602 is a wasteful number, since it uses less digits than its factorization.

643868602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24764192.

The product of its (nonzero) digits is 331776, while the sum is 43.

The square root of 643868602 is about 25374.5660455504. The cubic root of 643868602 is about 863.5067745666.

The spelling of 643868602 in words is "six hundred forty-three million, eight hundred sixty-eight thousand, six hundred two".