809021320 has 32 divisors (see below), whose sum is σ = 1899443520. Its totient is φ = 309538240.

The previous prime is 809021281. The next prime is 809021321. The reversal of 809021320 is 23120908.

It is not an unprimeable number, because it can be changed into a prime (809021321) 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 7 ways as a sum of consecutive naturals, for example, 438766 + ... + 440605.

It is an arithmetic number, because the mean of its divisors is an integer number (59357610).

Almost surely, 2^809021320 is an apocalyptic number.

It is an amenable number.

809021320 is an abundant number, since it is smaller than the sum of its proper divisors (1090422200).

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

809021320 is a wasteful number, since it uses less digits than its factorization.

809021320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879405 (or 879401 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 809021320 is about 28443.3000898278. The cubic root of 809021320 is about 931.7941700719.

The spelling of 809021320 in words is "eight hundred nine million, twenty-one thousand, three hundred twenty".