28923728 has 10 divisors (see below), whose sum is σ = 56039754. Its totient is φ = 14461856.

The previous prime is 28923709. The next prime is 28923779. The reversal of 28923728 is 82732982.

It can be written as a sum of positive squares in only one way, i.e., 28601104 + 322624 = 5348^2 + 568^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 903851 + ... + 903882.

Almost surely, 2^28923728 is an apocalyptic number.

It is an amenable number.

28923728 is a deficient number, since it is larger than the sum of its proper divisors (27116026).

28923728 is a wasteful number, since it uses less digits than its factorization.

28923728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807741 (or 1807735 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 28923728 is about 5378.0784672595. The cubic root of 28923728 is about 306.9620992515.

The spelling of 28923728 in words is "twenty-eight million, nine hundred twenty-three thousand, seven hundred twenty-eight".