868802809 has 32 divisors (see below), whose sum is σ = 1047044096. Its totient is φ = 705438720.

The previous prime is 868802773. The next prime is 868802819. The reversal of 868802809 is 908208868.

It is a de Polignac number, because none of the positive numbers 2^k-868802809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (868802819) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2006257 + ... + 2006689.

It is an arithmetic number, because the mean of its divisors is an integer number (32720128).

Almost surely, 2^868802809 is an apocalyptic number.

It is an amenable number.

868802809 is a deficient number, since it is larger than the sum of its proper divisors (178241287).

868802809 is a wasteful number, since it uses less digits than its factorization.

868802809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665.

The product of its (nonzero) digits is 442368, while the sum is 49.

The square root of 868802809 is about 29475.4611329492. The cubic root of 868802809 is about 954.2021822859.

The spelling of 868802809 in words is "eight hundred sixty-eight million, eight hundred two thousand, eight hundred nine".