804475809 has 12 divisors (see below), whose sum is σ = 1162278052. Its totient is φ = 536198400.

The previous prime is 804475799. The next prime is 804475811. The reversal of 804475809 is 908574408.

It can be written as a sum of positive squares in 2 ways, for example, as 509495184 + 294980625 = 22572^2 + 17175^2 .

It is not a de Polignac number, because 804475809 - 2⁹ = 804475297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (804475879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56229 + ... + 69069.

Almost surely, 2^804475809 is an apocalyptic number.

It is an amenable number.

804475809 is a deficient number, since it is larger than the sum of its proper divisors (357802243).

804475809 is a wasteful number, since it uses less digits than its factorization.

804475809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19808 (or 19805 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 804475809 is about 28363.2827613448. The cubic root of 804475809 is about 930.0457868543.

The spelling of 804475809 in words is "eight hundred four million, four hundred seventy-five thousand, eight hundred nine".