22066728 has 16 divisors (see below), whose sum is σ = 55166880. Its totient is φ = 7355568.

The previous prime is 22066721. The next prime is 22066739. The reversal of 22066728 is 82766022.

It is not an unprimeable number, because it can be changed into a prime (22066721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459700 + ... + 459747.

It is an arithmetic number, because the mean of its divisors is an integer number (3447930).

Almost surely, 2^22066728 is an apocalyptic number.

It is an amenable number.

22066728 is an abundant number, since it is smaller than the sum of its proper divisors (33100152).

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

22066728 is a wasteful number, since it uses less digits than its factorization.

22066728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919456 (or 919452 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 22066728 is about 4697.5236029210. The cubic root of 22066728 is about 280.4869417951.

The spelling of 22066728 in words is "twenty-two million, sixty-six thousand, seven hundred twenty-eight".