78822229 has 2 divisors, whose sum is σ = 78822230. Its totient is φ = 78822228.

The previous prime is 78822223. The next prime is 78822253. The reversal of 78822229 is 92222887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53802225 + 25020004 = 7335^2 + 5002^2 .

It is a cyclic number.

It is not a de Polignac number, because 78822229 - 2¹⁷ = 78691157 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78822191 and 78822200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78822223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39411114 + 39411115.

It is an arithmetic number, because the mean of its divisors is an integer number (39411115).

Almost surely, 2^78822229 is an apocalyptic number.

It is an amenable number.

78822229 is a deficient number, since it is larger than the sum of its proper divisors (1).

78822229 is an equidigital number, since it uses as much as digits as its factorization.

78822229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 40.

The square root of 78822229 is about 8878.1883850254. The cubic root of 78822229 is about 428.7619499314.

The spelling of 78822229 in words is "seventy-eight million, eight hundred twenty-two thousand, two hundred twenty-nine".