66664628 has 12 divisors (see below), whose sum is σ = 116753280. Its totient is φ = 33306552.

The previous prime is 66664627. The next prime is 66664691. The reversal of 66664628 is 82646666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66664621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125 + ... + 11547.

It is an arithmetic number, because the mean of its divisors is an integer number (9729440).

Almost surely, 2^66664628 is an apocalyptic number.

It is an amenable number.

66664628 is a deficient number, since it is larger than the sum of its proper divisors (50088652).

66664628 is a wasteful number, since it uses less digits than its factorization.

66664628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12886 (or 12884 counting only the distinct ones).

The product of its digits is 497664, while the sum is 44.

The square root of 66664628 is about 8164.8409659956. The cubic root of 66664628 is about 405.4759998019.

The spelling of 66664628 in words is "sixty-six million, six hundred sixty-four thousand, six hundred twenty-eight".