643571112 has 32 divisors (see below), whose sum is σ = 1620511200. Its totient is φ = 212979264.

The previous prime is 643571111. The next prime is 643571171. The reversal of 643571112 is 211175346.

It is a self number, because there is not a number n which added to its sum of digits gives 643571112.

It is not an unprimeable number, because it can be changed into a prime (643571111) 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, 93123 + ... + 99794.

It is an arithmetic number, because the mean of its divisors is an integer number (50640975).

Almost surely, 2^643571112 is an apocalyptic number.

It is an amenable number.

643571112 is an abundant number, since it is smaller than the sum of its proper divisors (976940088).

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

643571112 is a wasteful number, since it uses less digits than its factorization.

643571112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193065 (or 193061 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 643571112 is about 25368.7033961139. The cubic root of 643571112 is about 863.3737638856.

The spelling of 643571112 in words is "six hundred forty-three million, five hundred seventy-one thousand, one hundred twelve".