78757879 has 2 divisors, whose sum is σ = 78757880. Its totient is φ = 78757878.

The previous prime is 78757859. The next prime is 78757891. The reversal of 78757879 is 97875787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78757879 - 2⁷ = 78757751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78757829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39378939 + 39378940.

It is an arithmetic number, because the mean of its divisors is an integer number (39378940).

Almost surely, 2^78757879 is an apocalyptic number.

78757879 is a deficient number, since it is larger than the sum of its proper divisors (1).

78757879 is an equidigital number, since it uses as much as digits as its factorization.

78757879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6914880, while the sum is 58.

The square root of 78757879 is about 8874.5635949043. The cubic root of 78757879 is about 428.6452385943.

The spelling of 78757879 in words is "seventy-eight million, seven hundred fifty-seven thousand, eight hundred seventy-nine".