22128666 has 32 divisors (see below), whose sum is σ = 51539328. Its totient is φ = 6202560.

The previous prime is 22128649. The next prime is 22128683. The reversal of 22128666 is 66682122.

It is an interprime number because it is at equal distance from previous prime (22128649) and next prime (22128683).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2745 + ... + 7196.

It is an arithmetic number, because the mean of its divisors is an integer number (1610604).

Almost surely, 2^22128666 is an apocalyptic number.

22128666 is an abundant number, since it is smaller than the sum of its proper divisors (29410662).

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

22128666 is a wasteful number, since it uses less digits than its factorization.

22128666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10006.

The product of its digits is 13824, while the sum is 33.

The square root of 22128666 is about 4704.1116058189. Note that the first 3 decimals coincide. The cubic root of 22128666 is about 280.7491249216.

It can be divided in two parts, 2212 and 8666, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 22128666 in words is "twenty-two million, one hundred twenty-eight thousand, six hundred sixty-six".