809728404 has 24 divisors (see below), whose sum is σ = 1890577248. Its totient is φ = 269736480.

The previous prime is 809728397. The next prime is 809728421. The reversal of 809728404 is 404827908.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1362 + ... + 40265.

It is an arithmetic number, because the mean of its divisors is an integer number (78774052).

Almost surely, 2^809728404 is an apocalyptic number.

It is an amenable number.

809728404 is an abundant number, since it is smaller than the sum of its proper divisors (1080848844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

809728404 is a wasteful number, since it uses less digits than its factorization.

809728404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43255 (or 43253 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 809728404 is about 28455.7270861245. The cubic root of 809728404 is about 932.0655534825.

The spelling of 809728404 in words is "eight hundred nine million, seven hundred twenty-eight thousand, four hundred four".