2778944 has 28 divisors (see below), whose sum is σ = 6303264. Its totient is φ = 1190784.

The previous prime is 2778917. The next prime is 2778967. The reversal of 2778944 is 4498772.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2654 + ... + 3549.

2^2778944 is an apocalyptic number.

It is an amenable number.

2778944 is an abundant number, since it is smaller than the sum of its proper divisors (3524320).

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

2778944 is an equidigital number, since it uses as much as digits as its factorization.

2778944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6222 (or 6212 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 2778944 is about 1667.0164966190. The cubic root of 2778944 is about 140.5917807295.

Subtracting from 2778944 its sum of digits (41), we obtain a triangular number (2778903 = T₂₃₅₇).

The spelling of 2778944 in words is "two million, seven hundred seventy-eight thousand, nine hundred forty-four".