78438287 has 2 divisors, whose sum is σ = 78438288. Its totient is φ = 78438286.

The previous prime is 78438263. The next prime is 78438293. The reversal of 78438287 is 78283487.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78438287 - 2⁶ = 78438223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78458287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39219143 + 39219144.

It is an arithmetic number, because the mean of its divisors is an integer number (39219144).

Almost surely, 2^78438287 is an apocalyptic number.

78438287 is a deficient number, since it is larger than the sum of its proper divisors (1).

78438287 is an equidigital number, since it uses as much as digits as its factorization.

78438287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 602112, while the sum is 47.

The square root of 78438287 is about 8856.5392225180. The cubic root of 78438287 is about 428.0646519943.

The spelling of 78438287 in words is "seventy-eight million, four hundred thirty-eight thousand, two hundred eighty-seven".