78888829 has 2 divisors, whose sum is σ = 78888830. Its totient is φ = 78888828.

The previous prime is 78888767. The next prime is 78888863. The reversal of 78888829 is 92888887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45225625 + 33663204 = 6725^2 + 5802^2 .

It is a cyclic number.

It is not a de Polignac number, because 78888829 - 2⁹ = 78888317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78880829) 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, 39444414 + 39444415.

It is an arithmetic number, because the mean of its divisors is an integer number (39444415).

Almost surely, 2^78888829 is an apocalyptic number.

It is an amenable number.

78888829 is a deficient number, since it is larger than the sum of its proper divisors (1).

78888829 is an equidigital number, since it uses as much as digits as its factorization.

78888829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4128768, while the sum is 58.

The square root of 78888829 is about 8881.9383582639. The cubic root of 78888829 is about 428.8826752117.

Adding to 78888829 its sum of digits (58), we get a palindrome (78888887).

The spelling of 78888829 in words is "seventy-eight million, eight hundred eighty-eight thousand, eight hundred twenty-nine".