78767879 has 2 divisors, whose sum is σ = 78767880. Its totient is φ = 78767878.

The previous prime is 78767833. The next prime is 78767917. The reversal of 78767879 is 97876787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78767879 - 2²⁰ = 77719303 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78767279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39383939 + 39383940.

It is an arithmetic number, because the mean of its divisors is an integer number (39383940).

Almost surely, 2^78767879 is an apocalyptic number.

78767879 is a deficient number, since it is larger than the sum of its proper divisors (1).

78767879 is an equidigital number, since it uses as much as digits as its factorization.

78767879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8297856, while the sum is 59.

The square root of 78767879 is about 8875.1269850070. The cubic root of 78767879 is about 428.6633797252.

The spelling of 78767879 in words is "seventy-eight million, seven hundred sixty-seven thousand, eight hundred seventy-nine".