2781868 has 6 divisors (see below), whose sum is σ = 4868276. Its totient is φ = 1390932.

The previous prime is 2781853. The next prime is 2781887. The reversal of 2781868 is 8681872.

2781868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2781868.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347730 + ... + 347737.

2^2781868 is an apocalyptic number.

It is an amenable number.

2781868 is a deficient number, since it is larger than the sum of its proper divisors (2086408).

2781868 is a wasteful number, since it uses less digits than its factorization.

2781868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695471 (or 695469 counting only the distinct ones).

The product of its digits is 43008, while the sum is 40.

The square root of 2781868 is about 1667.8932819578. The cubic root of 2781868 is about 140.6410735866.

The spelling of 2781868 in words is "two million, seven hundred eighty-one thousand, eight hundred sixty-eight".