2780749889 has 2 divisors, whose sum is σ = 2780749890. Its totient is φ = 2780749888.

The previous prime is 2780749859. The next prime is 2780749897. The reversal of 2780749889 is 9889470872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2686659889 + 94090000 = 51833^2 + 9700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2780749889 is a prime.

It is not a weakly prime, because it can be changed into another prime (2780749849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390374944 + 1390374945.

It is an arithmetic number, because the mean of its divisors is an integer number (1390374945).

Almost surely, 2^2780749889 is an apocalyptic number.

It is an amenable number.

2780749889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780749889 is an equidigital number, since it uses as much as digits as its factorization.

2780749889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16257024, while the sum is 62.

The square root of 2780749889 is about 52732.8160541422. The cubic root of 2780749889 is about 1406.2222852704. Note that the first 4 decimals are identical.

The spelling of 2780749889 in words is "two billion, seven hundred eighty million, seven hundred forty-nine thousand, eight hundred eighty-nine".