78930689 has 2 divisors, whose sum is σ = 78930690. Its totient is φ = 78930688.

The previous prime is 78930679. The next prime is 78930701. The reversal of 78930689 is 98603987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56130064 + 22800625 = 7492^2 + 4775^2 .

It is an emirp because it is prime and its reverse (98603987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78930689 - 2⁴ = 78930673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78930659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39465344 + 39465345.

It is an arithmetic number, because the mean of its divisors is an integer number (39465345).

Almost surely, 2^78930689 is an apocalyptic number.

It is an amenable number.

78930689 is a deficient number, since it is larger than the sum of its proper divisors (1).

78930689 is an equidigital number, since it uses as much as digits as its factorization.

78930689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 78930689 is about 8884.2945133533. The cubic root of 78930689 is about 428.9585197241.

The spelling of 78930689 in words is "seventy-eight million, nine hundred thirty thousand, six hundred eighty-nine".