78671711 has 2 divisors, whose sum is σ = 78671712. Its totient is φ = 78671710.

The previous prime is 78671689. The next prime is 78671713. The reversal of 78671711 is 11717687.

It is a strong prime.

It is an emirp because it is prime and its reverse (11717687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78671711 - 2¹⁰ = 78670687 is a prime.

It is a super-2 number, since 2×78671711² = 12378476223335042, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 78671713, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78671713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39335855 + 39335856.

It is an arithmetic number, because the mean of its divisors is an integer number (39335856).

Almost surely, 2^78671711 is an apocalyptic number.

78671711 is a deficient number, since it is larger than the sum of its proper divisors (1).

78671711 is an equidigital number, since it uses as much as digits as its factorization.

78671711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16464, while the sum is 38.

The square root of 78671711 is about 8869.7074923585. The cubic root of 78671711 is about 428.4888564359.

The spelling of 78671711 in words is "seventy-eight million, six hundred seventy-one thousand, seven hundred eleven".