78652109 has 2 divisors, whose sum is σ = 78652110. Its totient is φ = 78652108.

The previous prime is 78652099. The next prime is 78652127. The reversal of 78652109 is 90125687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68392900 + 10259209 = 8270^2 + 3203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78652109 is a prime.

It is a super-3 number, since 3×78652109³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78652909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39326054 + 39326055.

It is an arithmetic number, because the mean of its divisors is an integer number (39326055).

Almost surely, 2^78652109 is an apocalyptic number.

It is an amenable number.

78652109 is a deficient number, since it is larger than the sum of its proper divisors (1).

78652109 is an equidigital number, since it uses as much as digits as its factorization.

78652109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 78652109 is about 8868.6024265382. The cubic root of 78652109 is about 428.4532657679.

The spelling of 78652109 in words is "seventy-eight million, six hundred fifty-two thousand, one hundred nine".