643238546 has 16 divisors (see below), whose sum is σ = 978264000. Its totient is φ = 317164848.

The previous prime is 643238527. The next prime is 643238641. The reversal of 643238546 is 645832346.

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, 96200 + ... + 102668.

It is an arithmetic number, because the mean of its divisors is an integer number (61141500).

Almost surely, 2^643238546 is an apocalyptic number.

643238546 is a deficient number, since it is larger than the sum of its proper divisors (335025454).

643238546 is a wasteful number, since it uses less digits than its factorization.

643238546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7153.

The product of its digits is 414720, while the sum is 41.

The square root of 643238546 is about 25362.1478979995. The cubic root of 643238546 is about 863.2250218502.

The spelling of 643238546 in words is "six hundred forty-three million, two hundred thirty-eight thousand, five hundred forty-six".