2778732779 has 2 divisors, whose sum is σ = 2778732780. Its totient is φ = 2778732778.

The previous prime is 2778732763. The next prime is 2778732797. The reversal of 2778732779 is 9772378772.

Together with next prime (2778732797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2778732779 - 2⁴ = 2778732763 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2778732379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389366389 + 1389366390.

It is an arithmetic number, because the mean of its divisors is an integer number (1389366390).

Almost surely, 2^2778732779 is an apocalyptic number.

2778732779 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778732779 is an equidigital number, since it uses as much as digits as its factorization.

2778732779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14521248, while the sum is 59.

The square root of 2778732779 is about 52713.6868279956. The cubic root of 2778732779 is about 1405.8821862234.

The spelling of 2778732779 in words is "two billion, seven hundred seventy-eight million, seven hundred thirty-two thousand, seven hundred seventy-nine".