643471443 has 6 divisors (see below), whose sum is σ = 929458764. Its totient is φ = 428980956.

The previous prime is 643471441. The next prime is 643471447. The reversal of 643471443 is 344174346.

643471443 is a `hidden beast` number, since 643 + 4 + 7 + 1 + 4 + 4 + 3 = 666.

It is not a de Polignac number, because 643471443 - 2¹ = 643471441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643471398 and 643471407.

It is not an unprimeable number, because it can be changed into a prime (643471441) 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, 35748405 + ... + 35748422.

It is an arithmetic number, because the mean of its divisors is an integer number (154909794).

Almost surely, 2^643471443 is an apocalyptic number.

643471443 is a deficient number, since it is larger than the sum of its proper divisors (285987321).

643471443 is a wasteful number, since it uses less digits than its factorization.

643471443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71496833 (or 71496830 counting only the distinct ones).

The product of its digits is 96768, while the sum is 36.

The square root of 643471443 is about 25366.7389114171. The cubic root of 643471443 is about 863.3291917367.

It can be divided in two parts, 6434 and 71443, that added together give a palindrome (77877).

The spelling of 643471443 in words is "six hundred forty-three million, four hundred seventy-one thousand, four hundred forty-three".