820887868 has 12 divisors (see below), whose sum is σ = 1447866112. Its totient is φ = 407211840.

The previous prime is 820887863. The next prime is 820887869. The reversal of 820887868 is 868788028.

It is a happy number.

820887868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820887863) 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, 807453 + ... + 808468.

Almost surely, 2^820887868 is an apocalyptic number.

It is an amenable number.

820887868 is a deficient number, since it is larger than the sum of its proper divisors (626978244).

820887868 is a wasteful number, since it uses less digits than its factorization.

820887868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616052 (or 1616050 counting only the distinct ones).

The product of its (nonzero) digits is 2752512, while the sum is 55.

The square root of 820887868 is about 28651.1407800806. The cubic root of 820887868 is about 936.3278598567.

The spelling of 820887868 in words is "eight hundred twenty million, eight hundred eighty-seven thousand, eight hundred sixty-eight".