28027728 has 40 divisors (see below), whose sum is σ = 80451200. Its totient is φ = 9342432.

The previous prime is 28027711. The next prime is 28027739. The reversal of 28027728 is 82772082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28027692 and 28027701.

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 in 7 ways as a sum of consecutive naturals, for example, 32008 + ... + 32871.

It is an arithmetic number, because the mean of its divisors is an integer number (2011280).

Almost surely, 2^28027728 is an apocalyptic number.

It is an amenable number.

28027728 is an abundant number, since it is smaller than the sum of its proper divisors (52423472).

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

28027728 is a wasteful number, since it uses less digits than its factorization.

28027728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64896 (or 64884 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 28027728 is about 5294.1220235276. The cubic root of 28027728 is about 303.7591004742.

The spelling of 28027728 in words is "twenty-eight million, twenty-seven thousand, seven hundred twenty-eight".