2780085 has 64 divisors (see below), whose sum is σ = 5806080. Its totient is φ = 1102080.

The previous prime is 2780083. The next prime is 2780101. The reversal of 2780085 is 5800872.

It is not a de Polignac number, because 2780085 - 2¹ = 2780083 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780083) 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 63 ways as a sum of consecutive naturals, for example, 33454 + ... + 33536.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2^2780085 is an apocalyptic number.

It is an amenable number.

2780085 is an abundant number, since it is smaller than the sum of its proper divisors (3025995).

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

2780085 is a wasteful number, since it uses less digits than its factorization.

2780085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 2780085 is about 1667.3586896646. The cubic root of 2780085 is about 140.6110198448.

It can be divided in two parts, 2 and 780085, that added together give a palindrome (780087).

The spelling of 2780085 in words is "two million, seven hundred eighty thousand, eighty-five".