78569879 has 2 divisors, whose sum is σ = 78569880. Its totient is φ = 78569878.

The previous prime is 78569867. The next prime is 78569923. The reversal of 78569879 is 97896587.

It is a weak prime.

It is an emirp because it is prime and its reverse (97896587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78569879 - 2²⁴ = 61792663 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78569809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39284939 + 39284940.

It is an arithmetic number, because the mean of its divisors is an integer number (39284940).

Almost surely, 2^78569879 is an apocalyptic number.

78569879 is a deficient number, since it is larger than the sum of its proper divisors (1).

78569879 is an equidigital number, since it uses as much as digits as its factorization.

78569879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 59.

The square root of 78569879 is about 8863.9651962313. The cubic root of 78569879 is about 428.3038991551.

The spelling of 78569879 in words is "seventy-eight million, five hundred sixty-nine thousand, eight hundred seventy-nine".