78580849 has 2 divisors, whose sum is σ = 78580850. Its totient is φ = 78580848.

The previous prime is 78580847. The next prime is 78580889. The reversal of 78580849 is 94808587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76877824 + 1703025 = 8768^2 + 1305^2 .

It is an emirp because it is prime and its reverse (94808587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78580849 - 2¹ = 78580847 is a prime.

Together with 78580847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78580847) 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, 39290424 + 39290425.

It is an arithmetic number, because the mean of its divisors is an integer number (39290425).

Almost surely, 2^78580849 is an apocalyptic number.

It is an amenable number.

78580849 is a deficient number, since it is larger than the sum of its proper divisors (1).

78580849 is an equidigital number, since it uses as much as digits as its factorization.

78580849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 49.

The square root of 78580849 is about 8864.5839721896. The cubic root of 78580849 is about 428.3238316245.

The spelling of 78580849 in words is "seventy-eight million, five hundred eighty thousand, eight hundred forty-nine".