643384750 has 32 divisors (see below), whose sum is σ = 1256793408. Its totient is φ = 246162400.

The previous prime is 643384699. The next prime is 643384789. The reversal of 643384750 is 57483346.

643384750 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50197 + ... + 61696.

It is an arithmetic number, because the mean of its divisors is an integer number (39274794).

Almost surely, 2^643384750 is an apocalyptic number.

643384750 is a deficient number, since it is larger than the sum of its proper divisors (613408658).

643384750 is a wasteful number, since it uses less digits than its factorization.

643384750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111933 (or 111923 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 643384750 is about 25365.0300610900. The cubic root of 643384750 is about 863.2904187345.

The spelling of 643384750 in words is "six hundred forty-three million, three hundred eighty-four thousand, seven hundred fifty".