2808778 has 12 divisors (see below), whose sum is σ = 4901202. Its totient is φ = 1203720.

The previous prime is 2808763. The next prime is 2808779. The reversal of 2808778 is 8778082.

It can be written as a sum of positive squares in only one way, i.e., 1570009 + 1238769 = 1253^2 + 1113^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2808778.

It is not an unprimeable number, because it can be changed into a prime (2808779) 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 5 ways as a sum of consecutive naturals, for example, 14233 + ... + 14428.

2^2808778 is an apocalyptic number.

2808778 is a deficient number, since it is larger than the sum of its proper divisors (2092424).

2808778 is a wasteful number, since it uses less digits than its factorization.

2808778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28677 (or 28670 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 40.

The square root of 2808778 is about 1675.9409297466. The cubic root of 2808778 is about 141.0931095358.

The spelling of 2808778 in words is "two million, eight hundred eight thousand, seven hundred seventy-eight".