872821643820 has 48 divisors (see below), whose sum is σ = 2793029261568. Its totient is φ = 199502089920.

The previous prime is 872821643801. The next prime is 872821643833. The reversal of 872821643820 is 28346128278.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1039072966 + ... + 1039073805.

It is an arithmetic number, because the mean of its divisors is an integer number (58188109616).

Almost surely, 2^872821643820 is an apocalyptic number.

It is an amenable number.

872821643820 is an abundant number, since it is smaller than the sum of its proper divisors (1920207617748).

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

872821643820 is a wasteful number, since it uses less digits than its factorization.

872821643820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078146790 (or 2078146788 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 51.

The spelling of 872821643820 in words is "eight hundred seventy-two billion, eight hundred twenty-one million, six hundred forty-three thousand, eight hundred twenty".