2778738 has 16 divisors (see below), whose sum is σ = 5577600. Its totient is φ = 922896.

The previous prime is 2778697. The next prime is 2778739. The reversal of 2778738 is 8378772.

2778738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2778738.

It is not an unprimeable number, because it can be changed into a prime (2778739) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1431 + ... + 2757.

It is an arithmetic number, because the mean of its divisors is an integer number (348600).

2^2778738 is an apocalyptic number.

2778738 is an abundant number, since it is smaller than the sum of its proper divisors (2798862).

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

2778738 is a wasteful number, since it uses less digits than its factorization.

2778738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681.

The product of its digits is 131712, while the sum is 42.

The square root of 2778738 is about 1666.9547084429. The cubic root of 2778738 is about 140.5883066733.

The spelling of 2778738 in words is "two million, seven hundred seventy-eight thousand, seven hundred thirty-eight".