820868808 has 32 divisors (see below), whose sum is σ = 2056959360. Its totient is φ = 272984640.

The previous prime is 820868803. The next prime is 820868813. The reversal of 820868808 is 808868028.

It is an interprime number because it is at equal distance from previous prime (820868803) and next prime (820868813).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (820868803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29335 + ... + 50022.

It is an arithmetic number, because the mean of its divisors is an integer number (64279980).

Almost surely, 2^820868808 is an apocalyptic number.

It is an amenable number.

820868808 is an abundant number, since it is smaller than the sum of its proper divisors (1236090552).

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

820868808 is a wasteful number, since it uses less digits than its factorization.

820868808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79797 (or 79793 counting only the distinct ones).

The product of its (nonzero) digits is 393216, while the sum is 48.

The square root of 820868808 is about 28650.8081561411. The cubic root of 820868808 is about 936.3206130094.

The spelling of 820868808 in words is "eight hundred twenty million, eight hundred sixty-eight thousand, eight hundred eight".