78835643 has 2 divisors, whose sum is σ = 78835644. Its totient is φ = 78835642.

The previous prime is 78835621. The next prime is 78835649. The reversal of 78835643 is 34653887.

It is a strong prime.

It is an emirp because it is prime and its reverse (34653887) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78835643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78835594 and 78835603.

It is not a weakly prime, because it can be changed into another prime (78835649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39417821 + 39417822.

It is an arithmetic number, because the mean of its divisors is an integer number (39417822).

Almost surely, 2^78835643 is an apocalyptic number.

78835643 is a deficient number, since it is larger than the sum of its proper divisors (1).

78835643 is an equidigital number, since it uses as much as digits as its factorization.

78835643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 44.

The square root of 78835643 is about 8878.9437997996. The cubic root of 78835643 is about 428.7862708480.

The spelling of 78835643 in words is "seventy-eight million, eight hundred thirty-five thousand, six hundred forty-three".