66228207 has 8 divisors (see below), whose sum is σ = 88624176. Its totient is φ = 43992192.

The previous prime is 66228191. The next prime is 66228221. The reversal of 66228207 is 70282266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66228207 - 2⁴ = 66228191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66228287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39018 + ... + 40679.

It is an arithmetic number, because the mean of its divisors is an integer number (11078022).

Almost surely, 2^66228207 is an apocalyptic number.

66228207 is a deficient number, since it is larger than the sum of its proper divisors (22395969).

66228207 is a wasteful number, since it uses less digits than its factorization.

66228207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79977.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 66228207 is about 8138.0714545892. The cubic root of 66228207 is about 404.5892436591.

The spelling of 66228207 in words is "sixty-six million, two hundred twenty-eight thousand, two hundred seven".