78580289 has 2 divisors, whose sum is σ = 78580290. Its totient is φ = 78580288.

The previous prime is 78580279. The next prime is 78580297. The reversal of 78580289 is 98208587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47499664 + 31080625 = 6892^2 + 5575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78580289 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78580279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39290144 + 39290145.

It is an arithmetic number, because the mean of its divisors is an integer number (39290145).

Almost surely, 2^78580289 is an apocalyptic number.

It is an amenable number.

78580289 is a deficient number, since it is larger than the sum of its proper divisors (1).

78580289 is an equidigital number, since it uses as much as digits as its factorization.

78580289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 78580289 is about 8864.5523857666. The cubic root of 78580289 is about 428.3228141505.

The spelling of 78580289 in words is "seventy-eight million, five hundred eighty thousand, two hundred eighty-nine".