78811423 has 2 divisors, whose sum is σ = 78811424. Its totient is φ = 78811422.

The previous prime is 78811333. The next prime is 78811429. The reversal of 78811423 is 32411887.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (32411887) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78811423 is a prime.

It is a super-2 number, since 2×78811423² = 12422480790569858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78811429) 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, 39405711 + 39405712.

It is an arithmetic number, because the mean of its divisors is an integer number (39405712).

Almost surely, 2^78811423 is an apocalyptic number.

78811423 is a deficient number, since it is larger than the sum of its proper divisors (1).

78811423 is an equidigital number, since it uses as much as digits as its factorization.

78811423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 34.

The square root of 78811423 is about 8877.5797940655. The cubic root of 78811423 is about 428.7423555715.

The spelling of 78811423 in words is "seventy-eight million, eight hundred eleven thousand, four hundred twenty-three".