2872772781 has 4 divisors (see below), whose sum is σ = 3830363712. Its totient is φ = 1915181852.

The previous prime is 2872772743. The next prime is 2872772783. The reversal of 2872772781 is 1872772782.

2872772781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2872772781 - 2⁷ = 2872772653 is a prime.

It is a super-2 number, since 2×2872772781² = 16505646902508947922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2872772783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478795461 + ... + 478795466.

It is an arithmetic number, because the mean of its divisors is an integer number (957590928).

Almost surely, 2^2872772781 is an apocalyptic number.

It is an amenable number.

2872772781 is a deficient number, since it is larger than the sum of its proper divisors (957590931).

2872772781 is an equidigital number, since it uses as much as digits as its factorization.

2872772781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957590930.

The product of its digits is 1229312, while the sum is 51.

The square root of 2872772781 is about 53598.2535256514. The cubic root of 2872772781 is about 1421.5662116144.

Subtracting from 2872772781 its reverse (1872772782), we obtain a palindrome (999999999).

The spelling of 2872772781 in words is "two billion, eight hundred seventy-two million, seven hundred seventy-two thousand, seven hundred eighty-one".