2778005 has 8 divisors (see below), whose sum is σ = 3367224. Its totient is φ = 2200000.

The previous prime is 2777993. The next prime is 2778011. The reversal of 2778005 is 5008772.

2778005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1811716 + 966289 = 1346^2 + 983^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2778005 - 2¹⁰ = 2776981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2246 + ... + 3255.

It is an arithmetic number, because the mean of its divisors is an integer number (420903).

2^2778005 is an apocalyptic number.

It is an amenable number.

2778005 is a deficient number, since it is larger than the sum of its proper divisors (589219).

2778005 is a wasteful number, since it uses less digits than its factorization.

2778005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5607.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 2778005 is about 1666.7348319394. The cubic root of 2778005 is about 140.5759437120.

The spelling of 2778005 in words is "two million, seven hundred seventy-eight thousand, five".