78828559 has 2 divisors, whose sum is σ = 78828560. Its totient is φ = 78828558.

The previous prime is 78828523. The next prime is 78828619. The reversal of 78828559 is 95582887.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (95582887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78828559 - 2¹⁹ = 78304271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78825559) 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, 39414279 + 39414280.

It is an arithmetic number, because the mean of its divisors is an integer number (39414280).

Almost surely, 2^78828559 is an apocalyptic number.

78828559 is a deficient number, since it is larger than the sum of its proper divisors (1).

78828559 is an equidigital number, since it uses as much as digits as its factorization.

78828559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 52.

The square root of 78828559 is about 8878.5448695155. The cubic root of 78828559 is about 428.7734271950.

The spelling of 78828559 in words is "seventy-eight million, eight hundred twenty-eight thousand, five hundred fifty-nine".