78672871 has 2 divisors, whose sum is σ = 78672872. Its totient is φ = 78672870.

The previous prime is 78672851. The next prime is 78672883. The reversal of 78672871 is 17827687.

It is a strong prime.

It is an emirp because it is prime and its reverse (17827687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78672871 - 2¹³ = 78664679 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 (78672851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39336435 + 39336436.

It is an arithmetic number, because the mean of its divisors is an integer number (39336436).

Almost surely, 2^78672871 is an apocalyptic number.

78672871 is a deficient number, since it is larger than the sum of its proper divisors (1).

78672871 is an equidigital number, since it uses as much as digits as its factorization.

78672871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 263424, while the sum is 46.

The square root of 78672871 is about 8869.7728832254. The cubic root of 78672871 is about 428.4909624222.

The spelling of 78672871 in words is "seventy-eight million, six hundred seventy-two thousand, eight hundred seventy-one".