71806568 has 8 divisors (see below), whose sum is σ = 134637330. Its totient is φ = 35903280.

The previous prime is 71806561. The next prime is 71806583. The reversal of 71806568 is 86560817.

It can be written as a sum of positive squares in only one way, i.e., 40424164 + 31382404 = 6358^2 + 5602^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (71806561) 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, 4487903 + ... + 4487918.

Almost surely, 2^71806568 is an apocalyptic number.

It is an amenable number.

71806568 is a deficient number, since it is larger than the sum of its proper divisors (62830762).

71806568 is a wasteful number, since it uses less digits than its factorization.

71806568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8975827 (or 8975823 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 71806568 is about 8473.8756186293. The cubic root of 71806568 is about 415.6438797688.

The spelling of 71806568 in words is "seventy-one million, eight hundred six thousand, five hundred sixty-eight".