643750922 has 16 divisors (see below), whose sum is σ = 989900352. Its totient is φ = 313795680.

The previous prime is 643750909. The next prime is 643750931. The reversal of 643750922 is 229057346.

643750922 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184163 + ... + 187625.

It is an arithmetic number, because the mean of its divisors is an integer number (61868772).

Almost surely, 2^643750922 is an apocalyptic number.

643750922 is a deficient number, since it is larger than the sum of its proper divisors (346149430).

643750922 is a wasteful number, since it uses less digits than its factorization.

643750922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5773.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 643750922 is about 25372.2470821959. The cubic root of 643750922 is about 863.4541635896.

The spelling of 643750922 in words is "six hundred forty-three million, seven hundred fifty thousand, nine hundred twenty-two".