79805647 has 2 divisors, whose sum is σ = 79805648. Its totient is φ = 79805646.

The previous prime is 79805603. The next prime is 79805669. The reversal of 79805647 is 74650897.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (74650897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79805647 - 2¹¹ = 79803599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79805597 and 79805606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79802647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39902823 + 39902824.

It is an arithmetic number, because the mean of its divisors is an integer number (39902824).

Almost surely, 2^79805647 is an apocalyptic number.

79805647 is a deficient number, since it is larger than the sum of its proper divisors (1).

79805647 is an equidigital number, since it uses as much as digits as its factorization.

79805647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 79805647 is about 8933.4006402937. The cubic root of 79805647 is about 430.5377210184.

The spelling of 79805647 in words is "seventy-nine million, eight hundred five thousand, six hundred forty-seven".