7278779 has 2 divisors, whose sum is σ = 7278780. Its totient is φ = 7278778.

The previous prime is 7278773. The next prime is 7278781. The reversal of 7278779 is 9778727.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7278779 - 2¹⁶ = 7213243 is a prime.

Together with 7278781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7278773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3639389 + 3639390.

It is an arithmetic number, because the mean of its divisors is an integer number (3639390).

Almost surely, 2^7278779 is an apocalyptic number.

7278779 is a deficient number, since it is larger than the sum of its proper divisors (1).

7278779 is an equidigital number, since it uses as much as digits as its factorization.

7278779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345744, while the sum is 47.

The square root of 7278779 is about 2697.9212368044. The cubic root of 7278779 is about 193.7995857824.

The spelling of 7278779 in words is "seven million, two hundred seventy-eight thousand, seven hundred seventy-nine".