2780005 has 16 divisors (see below), whose sum is σ = 3483648. Its totient is φ = 2128000.

The previous prime is 2779991. The next prime is 2780039. The reversal of 2780005 is 5000872.

It is not a de Polignac number, because 2780005 - 2⁷ = 2779877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14460 + ... + 14650.

It is an arithmetic number, because the mean of its divisors is an integer number (217728).

2^2780005 is an apocalyptic number.

It is an amenable number.

2780005 is a deficient number, since it is larger than the sum of its proper divisors (703643).

2780005 is a wasteful number, since it uses less digits than its factorization.

2780005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 2780005 is about 1667.3346994530. The cubic root of 2780005 is about 140.6096710863.

Adding to 2780005 its reverse (5000872), we get a palindrome (7780877).

The spelling of 2780005 in words is "two million, seven hundred eighty thousand, five".