78933017 has 2 divisors, whose sum is σ = 78933018. Its totient is φ = 78933016.

The previous prime is 78933013. The next prime is 78933047. The reversal of 78933017 is 71033987.

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., 75707401 + 3225616 = 8701^2 + 1796^2 .

It is an emirp because it is prime and its reverse (71033987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78933017 - 2² = 78933013 is a prime.

It is not a weakly prime, because it can be changed into another prime (78933013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39466508 + 39466509.

It is an arithmetic number, because the mean of its divisors is an integer number (39466509).

Almost surely, 2^78933017 is an apocalyptic number.

It is an amenable number.

78933017 is a deficient number, since it is larger than the sum of its proper divisors (1).

78933017 is an equidigital number, since it uses as much as digits as its factorization.

78933017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 78933017 is about 8884.4255301060. The cubic root of 78933017 is about 428.9627369499.

The spelling of 78933017 in words is "seventy-eight million, nine hundred thirty-three thousand, seventeen".