2778028447 has 2 divisors, whose sum is σ = 2778028448. Its totient is φ = 2778028446.

The previous prime is 2778028441. The next prime is 2778028489. The reversal of 2778028447 is 7448208772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2778028447 - 2¹⁹ = 2777504159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2778028447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2778028441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389014223 + 1389014224.

It is an arithmetic number, because the mean of its divisors is an integer number (1389014224).

Almost surely, 2^2778028447 is an apocalyptic number.

2778028447 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778028447 is an equidigital number, since it uses as much as digits as its factorization.

2778028447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1404928, while the sum is 49.

The square root of 2778028447 is about 52707.0056728705. The cubic root of 2778028447 is about 1405.7633920864.

The spelling of 2778028447 in words is "two billion, seven hundred seventy-eight million, twenty-eight thousand, four hundred forty-seven".