222209128 has 8 divisors (see below), whose sum is σ = 416642130. Its totient is φ = 111104560.

The previous prime is 222209093. The next prime is 222209129. The reversal of 222209128 is 821902222.

222209128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 197627364 + 24581764 = 14058^2 + 4958^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 222209096 and 222209105.

It is not an unprimeable number, because it can be changed into a prime (222209129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13888063 + ... + 13888078.

Almost surely, 2^222209128 is an apocalyptic number.

It is an amenable number.

222209128 is a deficient number, since it is larger than the sum of its proper divisors (194433002).

222209128 is a wasteful number, since it uses less digits than its factorization.

222209128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27776147 (or 27776143 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 222209128 is about 14906.6806499636. The cubic root of 222209128 is about 605.6949671533.

The spelling of 222209128 in words is "two hundred twenty-two million, two hundred nine thousand, one hundred twenty-eight".