78808501 has 2 divisors, whose sum is σ = 78808502. Its totient is φ = 78808500.

The previous prime is 78808489. The next prime is 78808507. The reversal of 78808501 is 10580887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41280625 + 37527876 = 6425^2 + 6126^2 .

It is an emirp because it is prime and its reverse (10580887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78808501 - 2¹⁵ = 78775733 is a prime.

It is equal to p_4603996 and since 78808501 and 4603996 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78808507) 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, 39404250 + 39404251.

It is an arithmetic number, because the mean of its divisors is an integer number (39404251).

Almost surely, 2^78808501 is an apocalyptic number.

It is an amenable number.

78808501 is a deficient number, since it is larger than the sum of its proper divisors (1).

78808501 is an equidigital number, since it uses as much as digits as its factorization.

78808501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 78808501 is about 8877.4152206597. The cubic root of 78808501 is about 428.7370568445.

The spelling of 78808501 in words is "seventy-eight million, eight hundred eight thousand, five hundred one".