66700228 has 12 divisors (see below), whose sum is σ = 133400512. Its totient is φ = 28585800.

The previous prime is 66700217. The next prime is 66700229. The reversal of 66700228 is 82200766.

It is a happy number.

66700228 is an admirable number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66700228.

It is not an unprimeable number, because it can be changed into a prime (66700229) 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, 1191048 + ... + 1191103.

Almost surely, 2^66700228 is an apocalyptic number.

It is an amenable number.

66700228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66700228 is a wasteful number, since it uses less digits than its factorization.

66700228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382162 (or 2382160 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 66700228 is about 8167.0207542286. The cubic root of 66700228 is about 405.5481638930.

The spelling of 66700228 in words is "sixty-six million, seven hundred thousand, two hundred twenty-eight".