809799290 has 16 divisors (see below), whose sum is σ = 1463315112. Its totient is φ = 322658304.

The previous prime is 809799271. The next prime is 809799299. The reversal of 809799290 is 92997908.

It can be written as a sum of positive squares in 4 ways, for example, as 792816649 + 16982641 = 28157^2 + 4121^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (809799299) 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, 154979 + ... + 160118.

Almost surely, 2^809799290 is an apocalyptic number.

809799290 is a deficient number, since it is larger than the sum of its proper divisors (653515822).

809799290 is a wasteful number, since it uses less digits than its factorization.

809799290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315361.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 809799290 is about 28456.9726077810. The cubic root of 809799290 is about 932.0927512732.

The spelling of 809799290 in words is "eight hundred nine million, seven hundred ninety-nine thousand, two hundred ninety".