66886738 has 24 divisors (see below), whose sum is σ = 107768052. Its totient is φ = 31125504.

The previous prime is 66886723. The next prime is 66886741. The reversal of 66886738 is 83768866.

It can be written as a sum of positive squares in 6 ways, for example, as 51022449 + 15864289 = 7143^2 + 3983^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55470 + ... + 56662.

Almost surely, 2^66886738 is an apocalyptic number.

66886738 is a deficient number, since it is larger than the sum of its proper divisors (40881314).

66886738 is a wasteful number, since it uses less digits than its factorization.

66886738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326 (or 1309 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 52.

The square root of 66886738 is about 8178.4312676699. The cubic root of 66886738 is about 405.9258157550.

The spelling of 66886738 in words is "sixty-six million, eight hundred eighty-six thousand, seven hundred thirty-eight".