2781122785 has 8 divisors (see below), whose sum is σ = 3814111296. Its totient is φ = 1907055600.

The previous prime is 2781122779. The next prime is 2781122833. The reversal of 2781122785 is 5872211872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2781122785 - 2⁹ = 2781122273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39730291 + ... + 39730360.

It is an arithmetic number, because the mean of its divisors is an integer number (476763912).

Almost surely, 2^2781122785 is an apocalyptic number.

It is an amenable number.

2781122785 is a deficient number, since it is larger than the sum of its proper divisors (1032988511).

2781122785 is an equidigital number, since it uses as much as digits as its factorization.

2781122785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79460663.

The product of its digits is 125440, while the sum is 43.

The square root of 2781122785 is about 52736.3516466583. The cubic root of 2781122785 is about 1406.2851401655.

The spelling of 2781122785 in words is "two billion, seven hundred eighty-one million, one hundred twenty-two thousand, seven hundred eighty-five".