78380033 has 2 divisors, whose sum is σ = 78380034. Its totient is φ = 78380032.

The previous prime is 78380009. The next prime is 78380039. The reversal of 78380033 is 33008387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67043344 + 11336689 = 8188^2 + 3367^2 .

It is an emirp because it is prime and its reverse (33008387) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78380033 is a prime.

It is a super-2 number, since 2×78380033² = 12286859146162178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78380039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39190016 + 39190017.

It is an arithmetic number, because the mean of its divisors is an integer number (39190017).

Almost surely, 2^78380033 is an apocalyptic number.

It is an amenable number.

78380033 is a deficient number, since it is larger than the sum of its proper divisors (1).

78380033 is an equidigital number, since it uses as much as digits as its factorization.

78380033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 78380033 is about 8853.2498552791. The cubic root of 78380033 is about 427.9586550594.

The spelling of 78380033 in words is "seventy-eight million, three hundred eighty thousand, thirty-three".