2783278889 has 2 divisors, whose sum is σ = 2783278890. Its totient is φ = 2783278888.

The previous prime is 2783278819. The next prime is 2783278907. The reversal of 2783278889 is 9888723872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2296326400 + 486952489 = 47920^2 + 22067^2 .

It is a cyclic number.

It is not a de Polignac number, because 2783278889 - 2⁸ = 2783278633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2783278819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1391639444 + 1391639445.

It is an arithmetic number, because the mean of its divisors is an integer number (1391639445).

Almost surely, 2^2783278889 is an apocalyptic number.

It is an amenable number.

2783278889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2783278889 is an equidigital number, since it uses as much as digits as its factorization.

2783278889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21676032, while the sum is 62.

The square root of 2783278889 is about 52756.7899800585. The cubic root of 2783278889 is about 1406.6484603098.

The spelling of 2783278889 in words is "two billion, seven hundred eighty-three million, two hundred seventy-eight thousand, eight hundred eighty-nine".