809200645 has 16 divisors (see below), whose sum is σ = 1081859328. Its totient is φ = 575986240.

The previous prime is 809200643. The next prime is 809200681. The reversal of 809200645 is 546002908.

It is a happy number.

It is not a de Polignac number, because 809200645 - 2¹ = 809200643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 809200645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809200643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153934 + ... + 159103.

It is an arithmetic number, because the mean of its divisors is an integer number (67616208).

Almost surely, 2^809200645 is an apocalyptic number.

It is an amenable number.

809200645 is a deficient number, since it is larger than the sum of its proper divisors (272658683).

809200645 is a wasteful number, since it uses less digits than its factorization.

809200645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313100.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 809200645 is about 28446.4522392512. The cubic root of 809200645 is about 931.8630111276.

The spelling of 809200645 in words is "eight hundred nine million, two hundred thousand, six hundred forty-five".