22161228 has 12 divisors (see below), whose sum is σ = 51709560. Its totient is φ = 7387072.

The previous prime is 22161199. The next prime is 22161229. The reversal of 22161228 is 82216122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×22161228² = 982240052935968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22161198 and 22161207.

It is not an unprimeable number, because it can be changed into a prime (22161229) 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 3 ways as a sum of consecutive naturals, for example, 923373 + ... + 923396.

It is an arithmetic number, because the mean of its divisors is an integer number (4309130).

Almost surely, 2^22161228 is an apocalyptic number.

It is an amenable number.

22161228 is an abundant number, since it is smaller than the sum of its proper divisors (29548332).

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

22161228 is a wasteful number, since it uses less digits than its factorization.

22161228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846776 (or 1846774 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

The square root of 22161228 is about 4707.5713483706. The cubic root of 22161228 is about 280.8867634743.

The spelling of 22161228 in words is "twenty-two million, one hundred sixty-one thousand, two hundred twenty-eight".