78731333 has 2 divisors, whose sum is σ = 78731334. Its totient is φ = 78731332.

The previous prime is 78731309. The next prime is 78731347. The reversal of 78731333 is 33313787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52085089 + 26646244 = 7217^2 + 5162^2 .

It is a cyclic number.

It is not a de Polignac number, because 78731333 - 2⁸ = 78731077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78731293 and 78731302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78731363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39365666 + 39365667.

It is an arithmetic number, because the mean of its divisors is an integer number (39365667).

Almost surely, 2^78731333 is an apocalyptic number.

It is an amenable number.

78731333 is a deficient number, since it is larger than the sum of its proper divisors (1).

78731333 is an equidigital number, since it uses as much as digits as its factorization.

78731333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 35.

The square root of 78731333 is about 8873.0678460158. The cubic root of 78731333 is about 428.5970736982.

The spelling of 78731333 in words is "seventy-eight million, seven hundred thirty-one thousand, three hundred thirty-three".