78075017 has 2 divisors, whose sum is σ = 78075018. Its totient is φ = 78075016.

The previous prime is 78074993. The next prime is 78075043. The reversal of 78075017 is 71057087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78074896 + 121 = 8836^2 + 11^2 .

It is an emirp because it is prime and its reverse (71057087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78075017 - 2¹⁸ = 77812873 is a prime.

It is not a weakly prime, because it can be changed into another prime (78075077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39037508 + 39037509.

It is an arithmetic number, because the mean of its divisors is an integer number (39037509).

Almost surely, 2^78075017 is an apocalyptic number.

It is an amenable number.

78075017 is a deficient number, since it is larger than the sum of its proper divisors (1).

78075017 is an equidigital number, since it uses as much as digits as its factorization.

78075017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13720, while the sum is 35.

The square root of 78075017 is about 8836.0068469869. The cubic root of 78075017 is about 427.4027995102.

The spelling of 78075017 in words is "seventy-eight million, seventy-five thousand, seventeen".