71687012 has 6 divisors (see below), whose sum is σ = 125452278. Its totient is φ = 35843504.

The previous prime is 71687003. The next prime is 71687027. The reversal of 71687012 is 21078617.

It can be written as a sum of positive squares in only one way, i.e., 46022656 + 25664356 = 6784^2 + 5066^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71687012.

It is an unprimeable number.

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, 8960873 + ... + 8960880.

It is an arithmetic number, because the mean of its divisors is an integer number (20908713).

Almost surely, 2^71687012 is an apocalyptic number.

It is an amenable number.

71687012 is a deficient number, since it is larger than the sum of its proper divisors (53765266).

71687012 is a wasteful number, since it uses less digits than its factorization.

71687012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17921757 (or 17921755 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 71687012 is about 8466.8182926056. The cubic root of 71687012 is about 415.4130730073.

The spelling of 71687012 in words is "seventy-one million, six hundred eighty-seven thousand, twelve".