22166728 has 8 divisors (see below), whose sum is σ = 41562630. Its totient is φ = 11083360.

The previous prime is 22166719. The next prime is 22166741. The reversal of 22166728 is 82766122.

It can be written as a sum of positive squares in only one way, i.e., 16793604 + 5373124 = 4098^2 + 2318^2 .

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 = 22166693 and 22166702.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1385413 + ... + 1385428.

Almost surely, 2^22166728 is an apocalyptic number.

It is an amenable number.

22166728 is a deficient number, since it is larger than the sum of its proper divisors (19395902).

22166728 is a wasteful number, since it uses less digits than its factorization.

22166728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2770847 (or 2770843 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 22166728 is about 4708.1554774667. The cubic root of 22166728 is about 280.9099984895.

The spelling of 22166728 in words is "twenty-two million, one hundred sixty-six thousand, seven hundred twenty-eight".