71766664 has 32 divisors (see below), whose sum is σ = 137968920. Its totient is φ = 34983936.

The previous prime is 71766641. The next prime is 71766703. The reversal of 71766664 is 46666717.

It can be written as a sum of positive squares in 4 ways, for example, as 68194564 + 3572100 = 8258^2 + 1890^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71766664.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81394 + ... + 82270.

Almost surely, 2^71766664 is an apocalyptic number.

It is an amenable number.

71766664 is a deficient number, since it is larger than the sum of its proper divisors (66202256).

71766664 is a wasteful number, since it uses less digits than its factorization.

71766664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129 (or 1125 counting only the distinct ones).

The product of its digits is 254016, while the sum is 43.

The square root of 71766664 is about 8471.5207607607. The cubic root of 71766664 is about 415.5668722975.

It can be divided in two parts, 7 and 1766664, that added together give a palindrome (1766671).

The spelling of 71766664 in words is "seventy-one million, seven hundred sixty-six thousand, six hundred sixty-four".