809638590 has 16 divisors (see below), whose sum is σ = 1943132688. Its totient is φ = 215903616.

The previous prime is 809638573. The next prime is 809638619. The reversal of 809638590 is 95836908.

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 in 7 ways as a sum of consecutive naturals, for example, 13493947 + ... + 13494006.

It is an arithmetic number, because the mean of its divisors is an integer number (121445793).

Almost surely, 2^809638590 is an apocalyptic number.

809638590 is an abundant number, since it is smaller than the sum of its proper divisors (1133494098).

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

809638590 is a wasteful number, since it uses less digits than its factorization.

809638590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26987963.

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 809638590 is about 28454.1489066182. The cubic root of 809638590 is about 932.0310910502.

The spelling of 809638590 in words is "eight hundred nine million, six hundred thirty-eight thousand, five hundred ninety".