71687687 has 2 divisors, whose sum is σ = 71687688. Its totient is φ = 71687686.

The previous prime is 71687663. The next prime is 71687689. The reversal of 71687687 is 78678617.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71687687 - 2¹⁶ = 71622151 is a prime.

Together with 71687689, 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 (71687689) 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, 35843843 + 35843844.

It is an arithmetic number, because the mean of its divisors is an integer number (35843844).

Almost surely, 2^71687687 is an apocalyptic number.

71687687 is a deficient number, since it is larger than the sum of its proper divisors (1).

71687687 is an equidigital number, since it uses as much as digits as its factorization.

71687687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 790272, while the sum is 50.

The square root of 71687687 is about 8466.8581540026. The cubic root of 71687687 is about 415.4143768369.

The spelling of 71687687 in words is "seventy-one million, six hundred eighty-seven thousand, six hundred eighty-seven".