2811872856 has 128 divisors (see below), whose sum is σ = 7997552640. Its totient is φ = 817689600.

The previous prime is 2811872821. The next prime is 2811872863. The reversal of 2811872856 is 6582781182.

2811872856 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 an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 412516 + ... + 419276.

It is an arithmetic number, because the mean of its divisors is an integer number (62480880).

Almost surely, 2^2811872856 is an apocalyptic number.

2811872856 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2811872856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3998776320).

2811872856 is an abundant number, since it is smaller than the sum of its proper divisors (5185679784).

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

2811872856 is a wasteful number, since it uses less digits than its factorization.

2811872856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6857 (or 6853 counting only the distinct ones).

The product of its digits is 430080, while the sum is 48.

The square root of 2811872856 is about 53027.0954890045. The cubic root of 2811872856 is about 1411.4491172823.

The spelling of 2811872856 in words is "two billion, eight hundred eleven million, eight hundred seventy-two thousand, eight hundred fifty-six".