78088789 has 2 divisors, whose sum is σ = 78088790. Its totient is φ = 78088788.

The previous prime is 78088741. The next prime is 78088811. The reversal of 78088789 is 98788087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73102500 + 4986289 = 8550^2 + 2233^2 .

It is a cyclic number.

It is not a de Polignac number, because 78088789 - 2⁹ = 78088277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78088739) 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, 39044394 + 39044395.

It is an arithmetic number, because the mean of its divisors is an integer number (39044395).

Almost surely, 2^78088789 is an apocalyptic number.

It is an amenable number.

78088789 is a deficient number, since it is larger than the sum of its proper divisors (1).

78088789 is an equidigital number, since it uses as much as digits as its factorization.

78088789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1806336, while the sum is 55.

The square root of 78088789 is about 8836.7861239254. The cubic root of 78088789 is about 427.4279285272.

The spelling of 78088789 in words is "seventy-eight million, eighty-eight thousand, seven hundred eighty-nine".