78864223 has 2 divisors, whose sum is σ = 78864224. Its totient is φ = 78864222.

The previous prime is 78864221. The next prime is 78864229. The reversal of 78864223 is 32246887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78864223 - 2¹ = 78864221 is a prime.

Together with 78864221, it forms a pair of twin primes.

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 an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39432111 + 39432112.

It is an arithmetic number, because the mean of its divisors is an integer number (39432112).

Almost surely, 2^78864223 is an apocalyptic number.

78864223 is a deficient number, since it is larger than the sum of its proper divisors (1).

78864223 is an equidigital number, since it uses as much as digits as its factorization.

78864223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 40.

The square root of 78864223 is about 8880.5530796229. The cubic root of 78864223 is about 428.8380800321.

The spelling of 78864223 in words is "seventy-eight million, eight hundred sixty-four thousand, two hundred twenty-three".