66816228 has 48 divisors (see below), whose sum is σ = 162809024. Its totient is φ = 21306240.

The previous prime is 66816227. The next prime is 66816241. The reversal of 66816228 is 82261866.

It is not an unprimeable number, because it can be changed into a prime (66816221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25851 + ... + 28317.

Almost surely, 2^66816228 is an apocalyptic number.

It is an amenable number.

66816228 is an abundant number, since it is smaller than the sum of its proper divisors (95992796).

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

66816228 is a wasteful number, since it uses less digits than its factorization.

66816228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2572 (or 2570 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 66816228 is about 8174.1194021130. The cubic root of 66816228 is about 405.7831273166.

The spelling of 66816228 in words is "sixty-six million, eight hundred sixteen thousand, two hundred twenty-eight".