78668033 has 2 divisors, whose sum is σ = 78668034. Its totient is φ = 78668032.

The previous prime is 78667951. The next prime is 78668041. The reversal of 78668033 is 33086687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77933584 + 734449 = 8828^2 + 857^2 .

It is an emirp because it is prime and its reverse (33086687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78668033 - 2¹⁴ = 78651649 is a prime.

It is not a weakly prime, because it can be changed into another prime (78665033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39334016 + 39334017.

It is an arithmetic number, because the mean of its divisors is an integer number (39334017).

Almost surely, 2^78668033 is an apocalyptic number.

It is an amenable number.

78668033 is a deficient number, since it is larger than the sum of its proper divisors (1).

78668033 is an equidigital number, since it uses as much as digits as its factorization.

78668033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 78668033 is about 8869.5001550256. The cubic root of 78668033 is about 428.4821788701.

The spelling of 78668033 in words is "seventy-eight million, six hundred sixty-eight thousand, thirty-three".