809872266 has 32 divisors (see below), whose sum is σ = 1853815680. Its totient is φ = 231057216.

The previous prime is 809872201. The next prime is 809872307. The reversal of 809872266 is 662278908.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 16180 + ... + 43376.

It is an arithmetic number, because the mean of its divisors is an integer number (57931740).

Almost surely, 2^809872266 is an apocalyptic number.

809872266 is an abundant number, since it is smaller than the sum of its proper divisors (1043943414).

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

809872266 is a wasteful number, since it uses less digits than its factorization.

809872266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27918.

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 809872266 is about 28458.2547954016. The cubic root of 809872266 is about 932.1207493044.

It can be divided in two parts, 80 and 9872266, that added together give a triangular number (9872346 = T₄₄₄₃).

The spelling of 809872266 in words is "eight hundred nine million, eight hundred seventy-two thousand, two hundred sixty-six".