71686673 has 2 divisors, whose sum is σ = 71686674. Its totient is φ = 71686672.

The previous prime is 71686631. The next prime is 71686691. The reversal of 71686673 is 37668617.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62995969 + 8690704 = 7937^2 + 2948^2 .

It is a cyclic number.

It is not a de Polignac number, because 71686673 - 2²⁴ = 54909457 is a prime.

It is not a weakly prime, because it can be changed into another prime (71686613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35843336 + 35843337.

It is an arithmetic number, because the mean of its divisors is an integer number (35843337).

Almost surely, 2^71686673 is an apocalyptic number.

It is an amenable number.

71686673 is a deficient number, since it is larger than the sum of its proper divisors (1).

71686673 is an equidigital number, since it uses as much as digits as its factorization.

71686673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 44.

The square root of 71686673 is about 8466.7982732554. The cubic root of 71686673 is about 415.4124181920.

The spelling of 71686673 in words is "seventy-one million, six hundred eighty-six thousand, six hundred seventy-three".