820008871 has 4 divisors (see below), whose sum is σ = 894555144. Its totient is φ = 745462600.

The previous prime is 820008863. The next prime is 820008877. The reversal of 820008871 is 178800028.

820008871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 820008871 - 2³ = 820008863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820008877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37273120 + ... + 37273141.

It is an arithmetic number, because the mean of its divisors is an integer number (223638786).

Almost surely, 2^820008871 is an apocalyptic number.

820008871 is a deficient number, since it is larger than the sum of its proper divisors (74546273).

820008871 is a wasteful number, since it uses less digits than its factorization.

820008871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74546272.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 820008871 is about 28635.7970205126. The cubic root of 820008871 is about 935.9935375738.

Adding to 820008871 its reverse (178800028), we get a palindrome (998808899).

The spelling of 820008871 in words is "eight hundred twenty million, eight thousand, eight hundred seventy-one".