221928068 has 24 divisors (see below), whose sum is σ = 402550680. Its totient is φ = 106928640.

The previous prime is 221928061. The next prime is 221928071. The reversal of 221928068 is 860829122.

It can be written as a sum of positive squares in 4 ways, for example, as 24581764 + 197346304 = 4958^2 + 14048^2 .

It is not an unprimeable number, because it can be changed into a prime (221928061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69548 + ... + 72668.

It is an arithmetic number, because the mean of its divisors is an integer number (16772945).

Almost surely, 2^221928068 is an apocalyptic number.

It is an amenable number.

221928068 is a deficient number, since it is larger than the sum of its proper divisors (180622612).

221928068 is a wasteful number, since it uses less digits than its factorization.

221928068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3767 (or 3765 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 221928068 is about 14897.2503503163. The cubic root of 221928068 is about 605.4394894212.

The spelling of 221928068 in words is "two hundred twenty-one million, nine hundred twenty-eight thousand, sixty-eight".