78425873 has 2 divisors, whose sum is σ = 78425874. Its totient is φ = 78425872.

The previous prime is 78425857. The next prime is 78425909. The reversal of 78425873 is 37852487.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54051904 + 24373969 = 7352^2 + 4937^2 .

It is a cyclic number.

It is not a de Polignac number, because 78425873 - 2⁴ = 78425857 is a prime.

It is not a weakly prime, because it can be changed into another prime (78425813) 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, 39212936 + 39212937.

It is an arithmetic number, because the mean of its divisors is an integer number (39212937).

Almost surely, 2^78425873 is an apocalyptic number.

It is an amenable number.

78425873 is a deficient number, since it is larger than the sum of its proper divisors (1).

78425873 is an equidigital number, since it uses as much as digits as its factorization.

78425873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376320, while the sum is 44.

The square root of 78425873 is about 8855.8383567001. The cubic root of 78425873 is about 428.0420683167.

The spelling of 78425873 in words is "seventy-eight million, four hundred twenty-five thousand, eight hundred seventy-three".