809109428 has 6 divisors (see below), whose sum is σ = 1415941506. Its totient is φ = 404554712.

The previous prime is 809109419. The next prime is 809109439. The reversal of 809109428 is 824901908.

It can be written as a sum of positive squares in only one way, i.e., 664195984 + 144913444 = 25772^2 + 12038^2 .

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 as a sum of consecutive naturals, namely, 101138675 + ... + 101138682.

It is an arithmetic number, because the mean of its divisors is an integer number (235990251).

Almost surely, 2^809109428 is an apocalyptic number.

It is an amenable number.

809109428 is a deficient number, since it is larger than the sum of its proper divisors (606832078).

809109428 is a wasteful number, since it uses less digits than its factorization.

809109428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202277361 (or 202277359 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 809109428 is about 28444.8488834095. The cubic root of 809109428 is about 931.8279951139.

The spelling of 809109428 in words is "eight hundred nine million, one hundred nine thousand, four hundred twenty-eight".