78864229 has 2 divisors, whose sum is σ = 78864230. Its totient is φ = 78864228.

The previous prime is 78864223. The next prime is 78864257. The reversal of 78864229 is 92246887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50027329 + 28836900 = 7073^2 + 5370^2 .

It is a cyclic number.

It is not a de Polignac number, because 78864229 - 2³ = 78864221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78864221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39432114 + 39432115.

It is an arithmetic number, because the mean of its divisors is an integer number (39432115).

Almost surely, 2^78864229 is an apocalyptic number.

It is an amenable number.

78864229 is a deficient number, since it is larger than the sum of its proper divisors (1).

78864229 is an equidigital number, since it uses as much as digits as its factorization.

78864229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 46.

The square root of 78864229 is about 8880.5534174397. The cubic root of 78864229 is about 428.8380909075.

The spelling of 78864229 in words is "seventy-eight million, eight hundred sixty-four thousand, two hundred twenty-nine".