643288928427 has 6 divisors (see below), whose sum is σ = 929195118852. Its totient is φ = 428859285612.

The previous prime is 643288928407. The next prime is 643288928441. The reversal of 643288928427 is 724829882346.

643288928427 is a `hidden beast` number, since 6 + 4 + 328 + 8 + 9 + 284 + 27 = 666.

It is not a de Polignac number, because 643288928427 - 2⁷ = 643288928299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643288928407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35738273793 + ... + 35738273810.

It is an arithmetic number, because the mean of its divisors is an integer number (154865853142).

Almost surely, 2^643288928427 is an apocalyptic number.

643288928427 is a deficient number, since it is larger than the sum of its proper divisors (285906190425).

643288928427 is a wasteful number, since it uses less digits than its factorization.

643288928427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71476547609 (or 71476547606 counting only the distinct ones).

The product of its digits is 74317824, while the sum is 63.

The spelling of 643288928427 in words is "six hundred forty-three billion, two hundred eighty-eight million, nine hundred twenty-eight thousand, four hundred twenty-seven".