78785867 has 2 divisors, whose sum is σ = 78785868. Its totient is φ = 78785866.

The previous prime is 78785851. The next prime is 78785873. The reversal of 78785867 is 76858787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78785867 - 2⁴ = 78785851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78785807) 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, 39392933 + 39392934.

It is an arithmetic number, because the mean of its divisors is an integer number (39392934).

Almost surely, 2^78785867 is an apocalyptic number.

78785867 is a deficient number, since it is larger than the sum of its proper divisors (1).

78785867 is an equidigital number, since it uses as much as digits as its factorization.

78785867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5268480, while the sum is 56.

The square root of 78785867 is about 8876.1403211080. The cubic root of 78785867 is about 428.6960081269.

The spelling of 78785867 in words is "seventy-eight million, seven hundred eighty-five thousand, eight hundred sixty-seven".