2871820545912 has 96 divisors (see below), whose sum is σ = 7831540080000. Its totient is φ = 950668718400.

The previous prime is 2871820545901. The next prime is 2871820545917. The reversal of 2871820545912 is 2195450281782.

It is a happy number.

2871820545912 is a `hidden beast` number, since 2 + 8 + 7 + 1 + 8 + 2 + 0 + 545 + 91 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2871820545917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41050339 + ... + 41120237.

It is an arithmetic number, because the mean of its divisors is an integer number (81578542500).

Almost surely, 2^{2871820545912} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2871820545912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3915770040000).

2871820545912 is an abundant number, since it is smaller than the sum of its proper divisors (4959719534088).

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

2871820545912 is a wasteful number, since it uses less digits than its factorization.

2871820545912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73841 (or 73834 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 54.

The spelling of 2871820545912 in words is "two trillion, eight hundred seventy-one billion, eight hundred twenty million, five hundred forty-five thousand, nine hundred twelve".