66005704 has 8 divisors (see below), whose sum is σ = 123760710. Its totient is φ = 33002848.

The previous prime is 66005701. The next prime is 66005717. The reversal of 66005704 is 40750066.

It can be written as a sum of positive squares in only one way, i.e., 53260804 + 12744900 = 7298^2 + 3570^2 .

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

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66005701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4125349 + ... + 4125364.

Almost surely, 2^66005704 is an apocalyptic number.

It is an amenable number.

66005704 is a deficient number, since it is larger than the sum of its proper divisors (57755006).

66005704 is a wasteful number, since it uses less digits than its factorization.

66005704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8250719 (or 8250715 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 66005704 is about 8124.3894539836. The cubic root of 66005704 is about 404.1356437638.

The spelling of 66005704 in words is "sixty-six million, five thousand, seven hundred four".