643532075 has 6 divisors (see below), whose sum is σ = 797979804. Its totient is φ = 514825640.

The previous prime is 643532063. The next prime is 643532077. The reversal of 643532075 is 570235346.

643532075 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643532075 - 2¹⁰ = 643531051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643532077) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12870617 + ... + 12870666.

It is an arithmetic number, because the mean of its divisors is an integer number (132996634).

Almost surely, 2^643532075 is an apocalyptic number.

643532075 is a deficient number, since it is larger than the sum of its proper divisors (154447729).

643532075 is a wasteful number, since it uses less digits than its factorization.

643532075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25741293 (or 25741288 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 35.

The square root of 643532075 is about 25367.9339915571. The cubic root of 643532075 is about 863.3563070201.

The spelling of 643532075 in words is "six hundred forty-three million, five hundred thirty-two thousand, seventy-five".