28061328 has 80 divisors (see below), whose sum is σ = 79012800. Its totient is φ = 8547840.

The previous prime is 28061323. The next prime is 28061333. The reversal of 28061328 is 82316082.

It is an interprime number because it is at equal distance from previous prime (28061323) and next prime (28061333).

It is a junction number, because it is equal to n+sod(n) for n = 28061295 and 28061304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28061321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25918 + ... + 26978.

It is an arithmetic number, because the mean of its divisors is an integer number (987660).

Almost surely, 2^28061328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28061328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39506400).

28061328 is an abundant number, since it is smaller than the sum of its proper divisors (50951472).

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

28061328 is a wasteful number, since it uses less digits than its factorization.

28061328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120 (or 1114 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 28061328 is about 5297.2944037499. The cubic root of 28061328 is about 303.8804354370.

The spelling of 28061328 in words is "twenty-eight million, sixty-one thousand, three hundred twenty-eight".