78719801 has 2 divisors, whose sum is σ = 78719802. Its totient is φ = 78719800.

The previous prime is 78719779. The next prime is 78719867. The reversal of 78719801 is 10891787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43626025 + 35093776 = 6605^2 + 5924^2 .

It is an emirp because it is prime and its reverse (10891787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78719801 - 2¹⁸ = 78457657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78719101) 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, 39359900 + 39359901.

It is an arithmetic number, because the mean of its divisors is an integer number (39359901).

Almost surely, 2^78719801 is an apocalyptic number.

It is an amenable number.

78719801 is a deficient number, since it is larger than the sum of its proper divisors (1).

78719801 is an equidigital number, since it uses as much as digits as its factorization.

78719801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 78719801 is about 8872.4179906044. The cubic root of 78719801 is about 428.5761467364.

The spelling of 78719801 in words is "seventy-eight million, seven hundred nineteen thousand, eight hundred one".