2780361 has 6 divisors (see below), whose sum is σ = 4016090. Its totient is φ = 1853568.

The previous prime is 2780357. The next prime is 2780369. The reversal of 2780361 is 1630872.

2780361 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 only one way, i.e., 2742336 + 38025 = 1656^2 + 195^2 .

It is not a de Polignac number, because 2780361 - 2² = 2780357 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2780369) 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 5 ways as a sum of consecutive naturals, for example, 154456 + ... + 154473.

2^2780361 is an apocalyptic number.

It is an amenable number.

2780361 is a deficient number, since it is larger than the sum of its proper divisors (1235729).

2780361 is a wasteful number, since it uses less digits than its factorization.

2780361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308935 (or 308932 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 2780361 is about 1667.4414532451. The cubic root of 2780361 is about 140.6156728629.

The spelling of 2780361 in words is "two million, seven hundred eighty thousand, three hundred sixty-one".