643385298 has 32 divisors (see below), whose sum is σ = 1363924224. Its totient is φ = 201629952.

The previous prime is 643385297. The next prime is 643385299. The reversal of 643385298 is 892583346.

643385298 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (643385297) and next prime (643385299).

It is not an unprimeable number, because it can be changed into a prime (643385297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111111 + ... + 116757.

It is an arithmetic number, because the mean of its divisors is an integer number (42622632).

Almost surely, 2^643385298 is an apocalyptic number.

643385298 is an abundant number, since it is smaller than the sum of its proper divisors (720538926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643385298 is a wasteful number, since it uses less digits than its factorization.

643385298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6786.

The product of its digits is 1244160, while the sum is 48.

The square root of 643385298 is about 25365.0408633615. The cubic root of 643385298 is about 863.2906638356.

The spelling of 643385298 in words is "six hundred forty-three million, three hundred eighty-five thousand, two hundred ninety-eight".