78865417 has 2 divisors, whose sum is σ = 78865418. Its totient is φ = 78865416.

The previous prime is 78865411. The next prime is 78865421. The reversal of 78865417 is 71456887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51208336 + 27657081 = 7156^2 + 5259^2 .

It is a cyclic number.

It is not a de Polignac number, because 78865417 - 2⁷ = 78865289 is a prime.

It is not a weakly prime, because it can be changed into another prime (78865411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39432708 + 39432709.

It is an arithmetic number, because the mean of its divisors is an integer number (39432709).

Almost surely, 2^78865417 is an apocalyptic number.

It is an amenable number.

78865417 is a deficient number, since it is larger than the sum of its proper divisors (1).

78865417 is an equidigital number, since it uses as much as digits as its factorization.

78865417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376320, while the sum is 46.

The square root of 78865417 is about 8880.6203049111. The cubic root of 78865417 is about 428.8402442162.

The spelling of 78865417 in words is "seventy-eight million, eight hundred sixty-five thousand, four hundred seventeen".