2778428 has 24 divisors (see below), whose sum is σ = 5051760. Its totient is φ = 1336320.

The previous prime is 2778421. The next prime is 2778439. The reversal of 2778428 is 8248772.

2778428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2778391 and 2778400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778421) 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, 14300 + ... + 14492.

It is an arithmetic number, because the mean of its divisors is an integer number (210490).

2^2778428 is an apocalyptic number.

It is an amenable number.

2778428 is a deficient number, since it is larger than the sum of its proper divisors (2273332).

2778428 is a wasteful number, since it uses less digits than its factorization.

2778428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 315 counting only the distinct ones).

The product of its digits is 50176, while the sum is 38.

The square root of 2778428 is about 1666.8617219194. The cubic root of 2778428 is about 140.5830784011.

The spelling of 2778428 in words is "two million, seven hundred seventy-eight thousand, four hundred twenty-eight".