643673196 has 24 divisors (see below), whose sum is σ = 1668782640. Its totient is φ = 214557696.

The previous prime is 643673189. The next prime is 643673197. The reversal of 643673196 is 691376346.

It is not an unprimeable number, because it can be changed into a prime (643673197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2979861 + ... + 2980076.

It is an arithmetic number, because the mean of its divisors is an integer number (69532610).

Almost surely, 2^643673196 is an apocalyptic number.

It is an amenable number.

643673196 is an abundant number, since it is smaller than the sum of its proper divisors (1025109444).

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

643673196 is a wasteful number, since it uses less digits than its factorization.

643673196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5959950 (or 5959942 counting only the distinct ones).

The product of its digits is 489888, while the sum is 45.

The square root of 643673196 is about 25370.7153229861. The cubic root of 643673196 is about 863.4194112564.

The spelling of 643673196 in words is "six hundred forty-three million, six hundred seventy-three thousand, one hundred ninety-six".