643875312 has 20 divisors (see below), whose sum is σ = 1663344680. Its totient is φ = 214625088.

The previous prime is 643875307. The next prime is 643875373. The reversal of 643875312 is 213578346.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6706987 + ... + 6707082.

It is an arithmetic number, because the mean of its divisors is an integer number (83167234).

Almost surely, 2^643875312 is an apocalyptic number.

It is an amenable number.

643875312 is an abundant number, since it is smaller than the sum of its proper divisors (1019469368).

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

643875312 is a wasteful number, since it uses less digits than its factorization.

643875312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13414080 (or 13414074 counting only the distinct ones).

The product of its digits is 120960, while the sum is 39.

The square root of 643875312 is about 25374.6982642159. The cubic root of 643875312 is about 863.5097742006.

The spelling of 643875312 in words is "six hundred forty-three million, eight hundred seventy-five thousand, three hundred twelve".