806564643 has 16 divisors (see below), whose sum is σ = 1140694560. Its totient is φ = 505184256.

The previous prime is 806564593. The next prime is 806564651. The reversal of 806564643 is 346465608.

It is not a de Polignac number, because 806564643 - 2¹⁰ = 806563619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 806564595 and 806564604.

It is not an unprimeable number, because it can be changed into a prime (806564243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15723 + ... + 43131.

It is an arithmetic number, because the mean of its divisors is an integer number (71293410).

Almost surely, 2^806564643 is an apocalyptic number.

806564643 is a deficient number, since it is larger than the sum of its proper divisors (334129917).

806564643 is a wasteful number, since it uses less digits than its factorization.

806564643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28006.

The product of its (nonzero) digits is 414720, while the sum is 42.

The square root of 806564643 is about 28400.0817428401. The cubic root of 806564643 is about 930.8500506304.

The spelling of 806564643 in words is "eight hundred six million, five hundred sixty-four thousand, six hundred forty-three".