78808489 has 2 divisors, whose sum is σ = 78808490. Its totient is φ = 78808488.

The previous prime is 78808459. The next prime is 78808501. The reversal of 78808489 is 98480887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75986089 + 2822400 = 8717^2 + 1680^2 .

It is a cyclic number.

It is not a de Polignac number, because 78808489 - 2²¹ = 76711337 is a prime.

It is not a weakly prime, because it can be changed into another prime (78808459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39404244 + 39404245.

It is an arithmetic number, because the mean of its divisors is an integer number (39404245).

Almost surely, 2^78808489 is an apocalyptic number.

It is an amenable number.

78808489 is a deficient number, since it is larger than the sum of its proper divisors (1).

78808489 is an equidigital number, since it uses as much as digits as its factorization.

78808489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1032192, while the sum is 52.

The square root of 78808489 is about 8877.4145447872. The cubic root of 78808489 is about 428.7370350835.

It can be divided in two parts, 78808 and 489, that added together give a palindrome (79297).

The spelling of 78808489 in words is "seventy-eight million, eight hundred eight thousand, four hundred eighty-nine".