6728321228 has 24 divisors (see below), whose sum is σ = 11979431184. Its totient is φ = 3305736000.

The previous prime is 6728321227. The next prime is 6728321239. The reversal of 6728321228 is 8221238276.

It is a happy number.

It is a super-3 number, since 3×6728321228³ (a number of 30 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (6728321227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243326 + ... + 269562.

It is an arithmetic number, because the mean of its divisors is an integer number (499142966).

Almost surely, 2^6728321228 is an apocalyptic number.

It is an amenable number.

6728321228 is a deficient number, since it is larger than the sum of its proper divisors (5251109956).

6728321228 is a wasteful number, since it uses less digits than its factorization.

6728321228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27353 (or 27351 counting only the distinct ones).

The product of its digits is 129024, while the sum is 41.

The square root of 6728321228 is about 82026.3447192425. The cubic root of 6728321228 is about 1887.8561797196.

The spelling of 6728321228 in words is "six billion, seven hundred twenty-eight million, three hundred twenty-one thousand, two hundred twenty-eight".