643427108 has 12 divisors (see below), whose sum is σ = 1134099120. Its totient is φ = 319398792.

The previous prime is 643427107. The next prime is 643427111. The reversal of 643427108 is 801724346.

643427108 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (643427107) 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, 578066 + ... + 579177.

It is an arithmetic number, because the mean of its divisors is an integer number (94508260).

Almost surely, 2^643427108 is an apocalyptic number.

It is an amenable number.

643427108 is a deficient number, since it is larger than the sum of its proper divisors (490672012).

643427108 is a wasteful number, since it uses less digits than its factorization.

643427108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157386 (or 1157384 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 643427108 is about 25365.8650158042. The cubic root of 643427108 is about 863.3093635691.

The spelling of 643427108 in words is "six hundred forty-three million, four hundred twenty-seven thousand, one hundred eight".