78872671 has 2 divisors, whose sum is σ = 78872672. Its totient is φ = 78872670.

The previous prime is 78872669. The next prime is 78872701. The reversal of 78872671 is 17627887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78872671 - 2¹ = 78872669 is a prime.

Together with 78872669, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78872071) 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, 39436335 + 39436336.

It is an arithmetic number, because the mean of its divisors is an integer number (39436336).

Almost surely, 2^78872671 is an apocalyptic number.

78872671 is a deficient number, since it is larger than the sum of its proper divisors (1).

78872671 is an equidigital number, since it uses as much as digits as its factorization.

78872671 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 78872671 is about 8881.0287129364. The cubic root of 78872671 is about 428.8533919806.

The spelling of 78872671 in words is "seventy-eight million, eight hundred seventy-two thousand, six hundred seventy-one".