78090349 has 2 divisors, whose sum is σ = 78090350. Its totient is φ = 78090348.

The previous prime is 78090329. The next prime is 78090373. The reversal of 78090349 is 94309087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78057225 + 33124 = 8835^2 + 182^2 .

It is a cyclic number.

It is not a de Polignac number, because 78090349 - 2⁵ = 78090317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78090329) 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, 39045174 + 39045175.

It is an arithmetic number, because the mean of its divisors is an integer number (39045175).

Almost surely, 2^78090349 is an apocalyptic number.

It is an amenable number.

78090349 is a deficient number, since it is larger than the sum of its proper divisors (1).

78090349 is an equidigital number, since it uses as much as digits as its factorization.

78090349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 78090349 is about 8836.8743908692. The cubic root of 78090349 is about 427.4307747878.

The spelling of 78090349 in words is "seventy-eight million, ninety thousand, three hundred forty-nine".