800872645 has 4 divisors (see below), whose sum is σ = 961047180. Its totient is φ = 640698112.

The previous prime is 800872603. The next prime is 800872679. The reversal of 800872645 is 546278008.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 428614209 + 372258436 = 20703^2 + 19294^2 .

It is a cyclic number.

It is not a de Polignac number, because 800872645 - 2⁷ = 800872517 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 800872598 and 800872607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80087260 + ... + 80087269.

It is an arithmetic number, because the mean of its divisors is an integer number (240261795).

Almost surely, 2^800872645 is an apocalyptic number.

It is an amenable number.

800872645 is a deficient number, since it is larger than the sum of its proper divisors (160174535).

800872645 is a wasteful number, since it uses less digits than its factorization.

800872645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160174534.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 800872645 is about 28299.6933728972. The cubic root of 800872645 is about 928.6551823412.

The spelling of 800872645 in words is "eight hundred million, eight hundred seventy-two thousand, six hundred forty-five".