28082728 has 16 divisors (see below), whose sum is σ = 52888500. Its totient is φ = 13979136.

The previous prime is 28082723. The next prime is 28082729. The reversal of 28082728 is 82728082.

It can be written as a sum of positive squares in 2 ways, for example, as 28068804 + 13924 = 5298^2 + 118^2 .

It is a super-2 number, since 2×28082728² = 1577279223843968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28082723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5833 + ... + 9496.

Almost surely, 2^28082728 is an apocalyptic number.

It is an amenable number.

28082728 is a deficient number, since it is larger than the sum of its proper divisors (24805772).

28082728 is a wasteful number, since it uses less digits than its factorization.

28082728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15564 (or 15560 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 37.

The square root of 28082728 is about 5299.3139178577. The cubic root of 28082728 is about 303.9576637720.

The spelling of 28082728 in words is "twenty-eight million, eighty-two thousand, seven hundred twenty-eight".