643046873 has 4 divisors (see below), whose sum is σ = 734910720. Its totient is φ = 551183028.

The previous prime is 643046851. The next prime is 643046891. The reversal of 643046873 is 378640346.

643046873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 643046873 - 2¹⁸ = 642784729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643046873.

It is not an unprimeable number, because it can be changed into a prime (643046813) 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, 45931913 + ... + 45931926.

It is an arithmetic number, because the mean of its divisors is an integer number (183727680).

Almost surely, 2^643046873 is an apocalyptic number.

It is an amenable number.

643046873 is a deficient number, since it is larger than the sum of its proper divisors (91863847).

643046873 is an equidigital number, since it uses as much as digits as its factorization.

643046873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91863846.

The product of its (nonzero) digits is 290304, while the sum is 41.

The square root of 643046873 is about 25358.3688947061. The cubic root of 643046873 is about 863.1392717203.

The spelling of 643046873 in words is "six hundred forty-three million, forty-six thousand, eight hundred seventy-three".