28797728 has 24 divisors (see below), whose sum is σ = 60031692. Its totient is φ = 13551616.

The previous prime is 28797721. The next prime is 28797731. The reversal of 28797728 is 82779782.

It can be written as a sum of positive squares in 2 ways, for example, as 26915344 + 1882384 = 5188^2 + 1372^2 .

It is not an unprimeable number, because it can be changed into a prime (28797721) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 25925 + ... + 27012.

Almost surely, 2^28797728 is an apocalyptic number.

It is an amenable number.

28797728 is an abundant number, since it is smaller than the sum of its proper divisors (31233964).

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

28797728 is a wasteful number, since it uses less digits than its factorization.

28797728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52964 (or 52956 counting only the distinct ones).

The product of its digits is 790272, while the sum is 50.

The square root of 28797728 is about 5366.3514607226. The cubic root of 28797728 is about 306.5157123055.

The spelling of 28797728 in words is "twenty-eight million, seven hundred ninety-seven thousand, seven hundred twenty-eight".