66648228 has 24 divisors (see below), whose sum is σ = 164660832. Its totient is φ = 20909184.

The previous prime is 66648223. The next prime is 66648251. The reversal of 66648228 is 82284666.

It is a self number, because there is not a number n which added to its sum of digits gives 66648228.

It is not an unprimeable number, because it can be changed into a prime (66648221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163150 + ... + 163557.

It is an arithmetic number, because the mean of its divisors is an integer number (6860868).

Almost surely, 2^66648228 is an apocalyptic number.

66648228 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

66648228 is an abundant number, since it is smaller than the sum of its proper divisors (98012604).

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

66648228 is a wasteful number, since it uses less digits than its factorization.

66648228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326731 (or 326729 counting only the distinct ones).

The product of its digits is 221184, while the sum is 42.

The square root of 66648228 is about 8163.8365980708. The cubic root of 66648228 is about 405.4427470262.

The spelling of 66648228 in words is "sixty-six million, six hundred forty-eight thousand, two hundred twenty-eight".