809745312 has 24 divisors (see below), whose sum is σ = 2125581696. Its totient is φ = 269915072.

The previous prime is 809745301. The next prime is 809745319. The reversal of 809745312 is 213547908.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (809745319) 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 3 ways as a sum of consecutive naturals, for example, 4217328 + ... + 4217519.

It is an arithmetic number, because the mean of its divisors is an integer number (88565904).

Almost surely, 2^809745312 is an apocalyptic number.

It is an amenable number.

809745312 is an abundant number, since it is smaller than the sum of its proper divisors (1315836384).

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

809745312 is a wasteful number, since it uses less digits than its factorization.

809745312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8434860 (or 8434852 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 809745312 is about 28456.0241776675. The cubic root of 809745312 is about 932.0720409478.

The spelling of 809745312 in words is "eight hundred nine million, seven hundred forty-five thousand, three hundred twelve".