78057289 has 2 divisors, whose sum is σ = 78057290. Its totient is φ = 78057288.

The previous prime is 78057283. The next prime is 78057313. The reversal of 78057289 is 98275087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78057225 + 64 = 8835^2 + 8^2 .

It is a cyclic number.

It is not a de Polignac number, because 78057289 - 2³ = 78057281 is a prime.

It is not a weakly prime, because it can be changed into another prime (78057281) 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, 39028644 + 39028645.

It is an arithmetic number, because the mean of its divisors is an integer number (39028645).

Almost surely, 2^78057289 is an apocalyptic number.

It is an amenable number.

78057289 is a deficient number, since it is larger than the sum of its proper divisors (1).

78057289 is an equidigital number, since it uses as much as digits as its factorization.

78057289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 78057289 is about 8835.0036219574. The cubic root of 78057289 is about 427.3704478452.

The spelling of 78057289 in words is "seventy-eight million, fifty-seven thousand, two hundred eighty-nine".