2788871905 has 4 divisors (see below), whose sum is σ = 3346646292. Its totient is φ = 2231097520.

The previous prime is 2788871903. The next prime is 2788871909. The reversal of 2788871905 is 5091788872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2077262929 + 711608976 = 45577^2 + 26676^2 .

It is not a de Polignac number, because 2788871905 - 2¹ = 2788871903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2788871903) by changing a digit.

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, 278887186 + ... + 278887195.

It is an arithmetic number, because the mean of its divisors is an integer number (836661573).

Almost surely, 2^2788871905 is an apocalyptic number.

It is an amenable number.

2788871905 is a deficient number, since it is larger than the sum of its proper divisors (557774387).

2788871905 is an equidigital number, since it uses as much as digits as its factorization.

2788871905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557774386.

The product of its (nonzero) digits is 2257920, while the sum is 55.

The square root of 2788871905 is about 52809.7709235706. The cubic root of 2788871905 is about 1407.5900527823.

The spelling of 2788871905 in words is "two billion, seven hundred eighty-eight million, eight hundred seventy-one thousand, nine hundred five".