78089689 has 2 divisors, whose sum is σ = 78089690. Its totient is φ = 78089688.

The previous prime is 78089681. The next prime is 78089747. The reversal of 78089689 is 98698087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41062464 + 37027225 = 6408^2 + 6085^2 .

It is an emirp because it is prime and its reverse (98698087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78089689 - 2³ = 78089681 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78089681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39044844 + 39044845.

It is an arithmetic number, because the mean of its divisors is an integer number (39044845).

Almost surely, 2^78089689 is an apocalyptic number.

It is an amenable number.

78089689 is a deficient number, since it is larger than the sum of its proper divisors (1).

78089689 is an equidigital number, since it uses as much as digits as its factorization.

78089689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The square root of 78089689 is about 8836.8370472698. The cubic root of 78089689 is about 427.4295706052.

The spelling of 78089689 in words is "seventy-eight million, eighty-nine thousand, six hundred eighty-nine".