820608868 has 12 divisors (see below), whose sum is σ = 1436975932. Its totient is φ = 410044320.

The previous prime is 820608847. The next prime is 820608871. The reversal of 820608868 is 868806028.

It can be written as a sum of positive squares in 2 ways, for example, as 129549924 + 691058944 = 11382^2 + 26288^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57843 + ... + 70618.

Almost surely, 2^820608868 is an apocalyptic number.

It is an amenable number.

820608868 is a deficient number, since it is larger than the sum of its proper divisors (616367064).

820608868 is a wasteful number, since it uses less digits than its factorization.

820608868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130062 (or 130060 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 46.

The square root of 820608868 is about 28646.2714502254. The cubic root of 820608868 is about 936.2217694130.

The spelling of 820608868 in words is "eight hundred twenty million, six hundred eight thousand, eight hundred sixty-eight".