809605220090 has 16 divisors (see below), whose sum is σ = 1457303139072. Its totient is φ = 323839034064.

The previous prime is 809605220089. The next prime is 809605220167. The reversal of 809605220090 is 90022506908.

809605220090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×809605220090² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 954347 + ... + 1590593.

It is an arithmetic number, because the mean of its divisors is an integer number (91081446192).

Almost surely, 2^809605220090 is an apocalyptic number.

809605220090 is a deficient number, since it is larger than the sum of its proper divisors (647697918982).

809605220090 is a wasteful number, since it uses less digits than its factorization.

809605220090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763501.

The product of its (nonzero) digits is 77760, while the sum is 41.

Adding to 809605220090 its reverse (90022506908), we get a palindrome (899627726998).

The spelling of 809605220090 in words is "eight hundred nine billion, six hundred five million, two hundred twenty thousand, ninety".