78873329 has 2 divisors, whose sum is σ = 78873330. Its totient is φ = 78873328.

The previous prime is 78873281. The next prime is 78873337. The reversal of 78873329 is 92337887.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54390625 + 24482704 = 7375^2 + 4948^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78873329 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78873629) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39436664 + 39436665.

It is an arithmetic number, because the mean of its divisors is an integer number (39436665).

Almost surely, 2^78873329 is an apocalyptic number.

It is an amenable number.

78873329 is a deficient number, since it is larger than the sum of its proper divisors (1).

78873329 is an equidigital number, since it uses as much as digits as its factorization.

78873329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The square root of 78873329 is about 8881.0657581171. The cubic root of 78873329 is about 428.8545845557.

The spelling of 78873329 in words is "seventy-eight million, eight hundred seventy-three thousand, three hundred twenty-nine".