78835609 has 2 divisors, whose sum is σ = 78835610. Its totient is φ = 78835608.

The previous prime is 78835597. The next prime is 78835619. The reversal of 78835609 is 90653887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66912400 + 11923209 = 8180^2 + 3453^2 .

It is a cyclic number.

It is not a de Polignac number, because 78835609 - 2⁷ = 78835481 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78835619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39417804 + 39417805.

It is an arithmetic number, because the mean of its divisors is an integer number (39417805).

Almost surely, 2^78835609 is an apocalyptic number.

It is an amenable number.

78835609 is a deficient number, since it is larger than the sum of its proper divisors (1).

78835609 is an equidigital number, since it uses as much as digits as its factorization.

78835609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 78835609 is about 8878.9418851573. The cubic root of 78835609 is about 428.7862092061.

The spelling of 78835609 in words is "seventy-eight million, eight hundred thirty-five thousand, six hundred nine".