2780685 has 24 divisors (see below), whose sum is σ = 4903704. Its totient is φ = 1457280.

The previous prime is 2780683. The next prime is 2780693. The reversal of 2780685 is 5860872.

2780685 is nontrivially palindromic in base 14.

2780685 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 328329 + 2452356 = 573^2 + 1566^2 .

It is not a de Polignac number, because 2780685 - 2¹ = 2780683 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 (2780683) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2239 + ... + 3251.

It is an arithmetic number, because the mean of its divisors is an integer number (204321).

2^2780685 is an apocalyptic number.

It is an amenable number.

2780685 is a deficient number, since it is larger than the sum of its proper divisors (2123019).

2780685 is a wasteful number, since it uses less digits than its factorization.

2780685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085 (or 1082 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 2780685 is about 1667.5386052503. The cubic root of 2780685 is about 140.6211347086.

The spelling of 2780685 in words is "two million, seven hundred eighty thousand, six hundred eighty-five".