78888911 has 2 divisors, whose sum is σ = 78888912. Its totient is φ = 78888910.

The previous prime is 78888871. The next prime is 78888917. The reversal of 78888911 is 11988887.

It is a strong prime.

It is an emirp because it is prime and its reverse (11988887) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78888911 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78888911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78888917) 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, 39444455 + 39444456.

It is an arithmetic number, because the mean of its divisors is an integer number (39444456).

Almost surely, 2^78888911 is an apocalyptic number.

78888911 is a deficient number, since it is larger than the sum of its proper divisors (1).

78888911 is an equidigital number, since it uses as much as digits as its factorization.

78888911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 50.

The square root of 78888911 is about 8881.9429743722. The cubic root of 78888911 is about 428.8828238106.

The spelling of 78888911 in words is "seventy-eight million, eight hundred eighty-eight thousand, nine hundred eleven".