78578293 has 2 divisors, whose sum is σ = 78578294. Its totient is φ = 78578292.

The previous prime is 78578257. The next prime is 78578317. The reversal of 78578293 is 39287587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77035729 + 1542564 = 8777^2 + 1242^2 .

It is an emirp because it is prime and its reverse (39287587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78578293 - 2⁹ = 78577781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78578393) 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, 39289146 + 39289147.

It is an arithmetic number, because the mean of its divisors is an integer number (39289147).

Almost surely, 2^78578293 is an apocalyptic number.

It is an amenable number.

78578293 is a deficient number, since it is larger than the sum of its proper divisors (1).

78578293 is an equidigital number, since it uses as much as digits as its factorization.

78578293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 49.

The square root of 78578293 is about 8864.4398018149. The cubic root of 78578293 is about 428.3191875431.

The spelling of 78578293 in words is "seventy-eight million, five hundred seventy-eight thousand, two hundred ninety-three".