2784078 has 64 divisors (see below), whose sum is σ = 6969600. Its totient is φ = 816480.

The previous prime is 2784071. The next prime is 2784083. The reversal of 2784078 is 8704872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2784071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25488 + ... + 25596.

It is an arithmetic number, because the mean of its divisors is an integer number (108900).

2^2784078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2784078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3484800).

2784078 is an abundant number, since it is smaller than the sum of its proper divisors (4185522).

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

2784078 is a wasteful number, since it uses less digits than its factorization.

2784078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 2784078 is about 1668.5556628414. Note that the first 3 decimals coincide. The cubic root of 2784078 is about 140.6783069014.

It can be divided in two parts, 278 and 4078, that added together give a square (4356 = 66²).

The spelling of 2784078 in words is "two million, seven hundred eighty-four thousand, seventy-eight".