2780649 has 12 divisors (see below), whose sum is σ = 4165616. Its totient is φ = 1853604.

The previous prime is 2780647. The next prime is 2780671. The reversal of 2780649 is 9460872.

2780649 is a `hidden beast` number, since 2 + 7 + 8 + 0 + 649 = 666.

It is not a de Polignac number, because 2780649 - 2¹ = 2780647 is a prime.

It is a super-2 number, since 2×2780649² = 15464017722402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2780641) 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 11 ways as a sum of consecutive naturals, for example, 5479 + ... + 5964.

2^2780649 is an apocalyptic number.

It is an amenable number.

2780649 is a deficient number, since it is larger than the sum of its proper divisors (1384967).

2780649 is an equidigital number, since it uses as much as digits as its factorization.

2780649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11458 (or 11446 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 2780649 is about 1667.5278108625. The cubic root of 2780649 is about 140.6205278578.

The spelling of 2780649 in words is "two million, seven hundred eighty thousand, six hundred forty-nine".