643323036 has 24 divisors (see below), whose sum is σ = 1549510144. Its totient is φ = 207523440.

The previous prime is 643323007. The next prime is 643323047. The reversal of 643323036 is 630323346.

It is a junction number, because it is equal to n+sod(n) for n = 643322994 and 643323012.

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 7 ways as a sum of consecutive naturals, for example, 864310 + ... + 865053.

Almost surely, 2^643323036 is an apocalyptic number.

It is an amenable number.

643323036 is an abundant number, since it is smaller than the sum of its proper divisors (906187108).

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

643323036 is a wasteful number, since it uses less digits than its factorization.

643323036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1729401 (or 1729399 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 30.

The square root of 643323036 is about 25363.8135145329. The cubic root of 643323036 is about 863.2628153404.

The spelling of 643323036 in words is "six hundred forty-three million, three hundred twenty-three thousand, thirty-six".