643507036 has 12 divisors (see below), whose sum is σ = 1133596240. Its totient is φ = 319622400.

The previous prime is 643507031. The next prime is 643507037. The reversal of 643507036 is 630705346.

643507036 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 643506992 and 643507010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643507031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532101 + ... + 533308.

Almost surely, 2^643507036 is an apocalyptic number.

It is an amenable number.

643507036 is a deficient number, since it is larger than the sum of its proper divisors (490089204).

643507036 is a wasteful number, since it uses less digits than its factorization.

643507036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065564 (or 1065562 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 34.

The square root of 643507036 is about 25367.4404700198. The cubic root of 643507036 is about 863.3451095161.

The spelling of 643507036 in words is "six hundred forty-three million, five hundred seven thousand, thirty-six".