78265219 has 2 divisors, whose sum is σ = 78265220. Its totient is φ = 78265218.

The previous prime is 78265207. The next prime is 78265241. The reversal of 78265219 is 91256287.

It is a weak prime.

It is an emirp because it is prime and its reverse (91256287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78265219 - 2²¹ = 76168067 is a prime.

It is a super-2 number, since 2×78265219² = 12250889010235922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78215219) 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, 39132609 + 39132610.

It is an arithmetic number, because the mean of its divisors is an integer number (39132610).

Almost surely, 2^78265219 is an apocalyptic number.

78265219 is a deficient number, since it is larger than the sum of its proper divisors (1).

78265219 is an equidigital number, since it uses as much as digits as its factorization.

78265219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 78265219 is about 8846.7631933945. The cubic root of 78265219 is about 427.7495896695.

The spelling of 78265219 in words is "seventy-eight million, two hundred sixty-five thousand, two hundred nineteen".