809357904 has 60 divisors (see below), whose sum is σ = 2272441236. Its totient is φ = 268909056.

The previous prime is 809357903. The next prime is 809357921. The reversal of 809357904 is 409753908.

It can be written as a sum of positive squares in 2 ways, for example, as 430977600 + 378380304 = 20760^2 + 19452^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 809357904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809357903) 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 11 ways as a sum of consecutive naturals, for example, 36094 + ... + 54050.

Almost surely, 2^809357904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 809357904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1136220618).

809357904 is an abundant number, since it is smaller than the sum of its proper divisors (1463083332).

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

809357904 is a wasteful number, since it uses less digits than its factorization.

809357904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18284 (or 18275 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 809357904 is about 28449.2162282197. The cubic root of 809357904 is about 931.9233728990.

The spelling of 809357904 in words is "eight hundred nine million, three hundred fifty-seven thousand, nine hundred four".