809869872 has 80 divisors (see below), whose sum is σ = 2431630080. Its totient is φ = 227463936.

The previous prime is 809869871. The next prime is 809869913. The reversal of 809869872 is 278968908.

It is not an unprimeable number, because it can be changed into a prime (809869871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 603 + ... + 40250.

It is an arithmetic number, because the mean of its divisors is an integer number (30395376).

Almost surely, 2^809869872 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 809869872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1215815040).

809869872 is an abundant number, since it is smaller than the sum of its proper divisors (1621760208).

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

809869872 is a wasteful number, since it uses less digits than its factorization.

809869872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40930 (or 40924 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 57.

The square root of 809869872 is about 28458.2127337611. The cubic root of 809869872 is about 932.1198308471.

The spelling of 809869872 in words is "eight hundred nine million, eight hundred sixty-nine thousand, eight hundred seventy-two".