78224417 has 2 divisors, whose sum is σ = 78224418. Its totient is φ = 78224416.

The previous prime is 78224411. The next prime is 78224437. The reversal of 78224417 is 71442287.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52983841 + 25240576 = 7279^2 + 5024^2 .

It is a cyclic number.

It is not a de Polignac number, because 78224417 - 2¹⁰ = 78223393 is a prime.

It is a super-2 number, since 2×78224417² = 12238118829979778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78224411) 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, 39112208 + 39112209.

It is an arithmetic number, because the mean of its divisors is an integer number (39112209).

Almost surely, 2^78224417 is an apocalyptic number.

It is an amenable number.

78224417 is a deficient number, since it is larger than the sum of its proper divisors (1).

78224417 is an equidigital number, since it uses as much as digits as its factorization.

78224417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25088, while the sum is 35.

The square root of 78224417 is about 8844.4568516105. The cubic root of 78224417 is about 427.6752438626.

The spelling of 78224417 in words is "seventy-eight million, two hundred twenty-four thousand, four hundred seventeen".