78088513 has 2 divisors, whose sum is σ = 78088514. Its totient is φ = 78088512.

The previous prime is 78088489. The next prime is 78088547. The reversal of 78088513 is 31588087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75550864 + 2537649 = 8692^2 + 1593^2 .

It is an emirp because it is prime and its reverse (31588087) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78088513 is a prime.

It is not a weakly prime, because it can be changed into another prime (78088553) 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, 39044256 + 39044257.

It is an arithmetic number, because the mean of its divisors is an integer number (39044257).

Almost surely, 2^78088513 is an apocalyptic number.

It is an amenable number.

78088513 is a deficient number, since it is larger than the sum of its proper divisors (1).

78088513 is an equidigital number, since it uses as much as digits as its factorization.

78088513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 78088513 is about 8836.7705073743. The cubic root of 78088513 is about 427.4274249541.

The spelling of 78088513 in words is "seventy-eight million, eighty-eight thousand, five hundred thirteen".