22749728 has 12 divisors (see below), whose sum is σ = 44788590. Its totient is φ = 11374848.

The previous prime is 22749679. The next prime is 22749761. The reversal of 22749728 is 82794722.

It can be written as a sum of positive squares in only one way, i.e., 13337104 + 9412624 = 3652^2 + 3068^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 355433 + ... + 355496.

Almost surely, 2^22749728 is an apocalyptic number.

It is an amenable number.

22749728 is a deficient number, since it is larger than the sum of its proper divisors (22038862).

22749728 is an equidigital number, since it uses as much as digits as its factorization.

22749728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710939 (or 710931 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 22749728 is about 4769.6674936519. The cubic root of 22749728 is about 283.3514261418.

The spelling of 22749728 in words is "twenty-two million, seven hundred forty-nine thousand, seven hundred twenty-eight".