78036289 has 2 divisors, whose sum is σ = 78036290. Its totient is φ = 78036288.

The previous prime is 78036281. The next prime is 78036319. The reversal of 78036289 is 98263087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78021889 + 14400 = 8833^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 78036289 - 2³ = 78036281 is a prime.

It is not a weakly prime, because it can be changed into another prime (78036281) 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, 39018144 + 39018145.

It is an arithmetic number, because the mean of its divisors is an integer number (39018145).

Almost surely, 2^78036289 is an apocalyptic number.

It is an amenable number.

78036289 is a deficient number, since it is larger than the sum of its proper divisors (1).

78036289 is an equidigital number, since it uses as much as digits as its factorization.

78036289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 78036289 is about 8833.8150874919. The cubic root of 78036289 is about 427.3321187987.

The spelling of 78036289 in words is "seventy-eight million, thirty-six thousand, two hundred eighty-nine".