78104617 has 2 divisors, whose sum is σ = 78104618. Its totient is φ = 78104616.

The previous prime is 78104597. The next prime is 78104651. The reversal of 78104617 is 71640187.

It is an a-pointer prime, because the next prime (78104651) can be obtained adding 78104617 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40208281 + 37896336 = 6341^2 + 6156^2 .

It is an emirp because it is prime and its reverse (71640187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78104617 - 2¹¹ = 78102569 is a prime.

It is a super-2 number, since 2×78104617² = 12200662393433378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78104657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39052308 + 39052309.

It is an arithmetic number, because the mean of its divisors is an integer number (39052309).

Almost surely, 2^78104617 is an apocalyptic number.

It is an amenable number.

78104617 is a deficient number, since it is larger than the sum of its proper divisors (1).

78104617 is an equidigital number, since it uses as much as digits as its factorization.

78104617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 78104617 is about 8837.6816530129. The cubic root of 78104617 is about 427.4568053664.

The spelling of 78104617 in words is "seventy-eight million, one hundred four thousand, six hundred seventeen".