78417223 has 2 divisors, whose sum is σ = 78417224. Its totient is φ = 78417222.

The previous prime is 78417221. The next prime is 78417289. The reversal of 78417223 is 32271487.

It is a weak prime.

It is an emirp because it is prime and its reverse (32271487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78417223 - 2¹ = 78417221 is a prime.

It is a super-2 number, since 2×78417223² = 12298521726063458, which contains 22 as substring.

Together with 78417221, 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 (78417221) 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, 39208611 + 39208612.

It is an arithmetic number, because the mean of its divisors is an integer number (39208612).

Almost surely, 2^78417223 is an apocalyptic number.

78417223 is a deficient number, since it is larger than the sum of its proper divisors (1).

78417223 is an equidigital number, since it uses as much as digits as its factorization.

78417223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 34.

The square root of 78417223 is about 8855.3499648518. The cubic root of 78417223 is about 428.0263307381.

The spelling of 78417223 in words is "seventy-eight million, four hundred seventeen thousand, two hundred twenty-three".