22661728 has 12 divisors (see below), whose sum is σ = 44615340. Its totient is φ = 11330848.

The previous prime is 22661711. The next prime is 22661729. The reversal of 22661728 is 82716622.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 22661693 and 22661702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22661729) 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, 354058 + ... + 354121.

It is an arithmetic number, because the mean of its divisors is an integer number (3717945).

Almost surely, 2^22661728 is an apocalyptic number.

It is an amenable number.

22661728 is a deficient number, since it is larger than the sum of its proper divisors (21953612).

22661728 is an equidigital number, since it uses as much as digits as its factorization.

22661728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708189 (or 708181 counting only the distinct ones).

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

The square root of 22661728 is about 4760.4335936971. The cubic root of 22661728 is about 282.9856027837.

The spelling of 22661728 in words is "twenty-two million, six hundred sixty-one thousand, seven hundred twenty-eight".