643825196 has 24 divisors (see below), whose sum is σ = 1290732576. Its totient is φ = 275264640.

The previous prime is 643825187. The next prime is 643825211. The reversal of 643825196 is 691528346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15521 + ... + 39096.

It is an arithmetic number, because the mean of its divisors is an integer number (53780524).

Almost surely, 2^643825196 is an apocalyptic number.

It is an amenable number.

643825196 is an abundant number, since it is smaller than the sum of its proper divisors (646907380).

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

643825196 is a wasteful number, since it uses less digits than its factorization.

643825196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55049 (or 55047 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 643825196 is about 25373.7107258674. The cubic root of 643825196 is about 863.4873698738.

The spelling of 643825196 in words is "six hundred forty-three million, eight hundred twenty-five thousand, one hundred ninety-six".