22571728 has 10 divisors (see below), whose sum is σ = 43732754. Its totient is φ = 11285856.

The previous prime is 22571723. The next prime is 22571741. The reversal of 22571728 is 82717522.

It can be written as a sum of positive squares in only one way, i.e., 22543504 + 28224 = 4748^2 + 168^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22571693 and 22571702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22571723) 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 as a sum of consecutive naturals, namely, 705351 + ... + 705382.

Almost surely, 2^22571728 is an apocalyptic number.

It is an amenable number.

22571728 is a deficient number, since it is larger than the sum of its proper divisors (21161026).

22571728 is a wasteful number, since it uses less digits than its factorization.

22571728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410741 (or 1410735 counting only the distinct ones).

The product of its digits is 15680, while the sum is 34.

The square root of 22571728 is about 4750.9712691196. The cubic root of 22571728 is about 282.6104843643.

The spelling of 22571728 in words is "twenty-two million, five hundred seventy-one thousand, seven hundred twenty-eight".