2878911649 has 2 divisors, whose sum is σ = 2878911650. Its totient is φ = 2878911648.

The previous prime is 2878911647. The next prime is 2878911661. The reversal of 2878911649 is 9461198782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2854230625 + 24681024 = 53425^2 + 4968^2 .

It is a cyclic number.

It is not a de Polignac number, because 2878911649 - 2¹ = 2878911647 is a prime.

Together with 2878911647, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2878911649.

It is not a weakly prime, because it can be changed into another prime (2878911647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1439455824 + 1439455825.

It is an arithmetic number, because the mean of its divisors is an integer number (1439455825).

Almost surely, 2^2878911649 is an apocalyptic number.

It is an amenable number.

2878911649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2878911649 is an equidigital number, since it uses as much as digits as its factorization.

2878911649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 55.

The square root of 2878911649 is about 53655.4903900803. The cubic root of 2878911649 is about 1422.5780793829.

The spelling of 2878911649 in words is "two billion, eight hundred seventy-eight million, nine hundred eleven thousand, six hundred forty-nine".