78002609 has 2 divisors, whose sum is σ = 78002610. Its totient is φ = 78002608.

The previous prime is 78002513. The next prime is 78002611. The reversal of 78002609 is 90620087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56175025 + 21827584 = 7495^2 + 4672^2 .

It is an emirp because it is prime and its reverse (90620087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78002609 - 2¹² = 77998513 is a prime.

Together with 78002611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78002629) 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, 39001304 + 39001305.

It is an arithmetic number, because the mean of its divisors is an integer number (39001305).

Almost surely, 2^78002609 is an apocalyptic number.

It is an amenable number.

78002609 is a deficient number, since it is larger than the sum of its proper divisors (1).

78002609 is an equidigital number, since it uses as much as digits as its factorization.

78002609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 78002609 is about 8831.9085706318. The cubic root of 78002609 is about 427.2706319485.

The spelling of 78002609 in words is "seventy-eight million, two thousand, six hundred nine".