78877871 has 2 divisors, whose sum is σ = 78877872. Its totient is φ = 78877870.

The previous prime is 78877861. The next prime is 78877889. The reversal of 78877871 is 17877887.

It is a weak prime.

It is an emirp because it is prime and its reverse (17877887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78877871 - 2¹⁸ = 78615727 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78877801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39438935 + 39438936.

It is an arithmetic number, because the mean of its divisors is an integer number (39438936).

Almost surely, 2^78877871 is an apocalyptic number.

78877871 is a deficient number, since it is larger than the sum of its proper divisors (1).

78877871 is an equidigital number, since it uses as much as digits as its factorization.

78877871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1229312, while the sum is 53.

The square root of 78877871 is about 8881.3214669890. The cubic root of 78877871 is about 428.8628164052.

The spelling of 78877871 in words is "seventy-eight million, eight hundred seventy-seven thousand, eight hundred seventy-one".