643543678392 has 32 divisors (see below), whose sum is σ = 1612349156880. Its totient is φ = 214049231360.

The previous prime is 643543678391. The next prime is 643543678399. The reversal of 643543678392 is 293876345346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643543678391) 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, 29071713 + ... + 29093840.

Almost surely, 2^643543678392 is an apocalyptic number.

It is an amenable number.

643543678392 is an abundant number, since it is smaller than the sum of its proper divisors (968805478488).

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

643543678392 is a wasteful number, since it uses less digits than its factorization.

643543678392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58166023 (or 58166019 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 60.

The spelling of 643543678392 in words is "six hundred forty-three billion, five hundred forty-three million, six hundred seventy-eight thousand, three hundred ninety-two".