28668528 has 180 divisors, whose sum is σ = 99234720. Its totient is φ = 7676928.

The previous prime is 28668517. The next prime is 28668539. The reversal of 28668528 is 82586682.

It is an interprime number because it is at equal distance from previous prime (28668517) and next prime (28668539).

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 35 ways as a sum of consecutive naturals, for example, 119833 + ... + 120071.

It is an arithmetic number, because the mean of its divisors is an integer number (551304).

Almost surely, 2^28668528 is an apocalyptic number.

28668528 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28668528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49617360).

28668528 is an abundant number, since it is smaller than the sum of its proper divisors (70566192).

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

28668528 is a wasteful number, since it uses less digits than its factorization.

28668528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 268 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 28668528 is about 5354.2999542424. The cubic root of 28668528 is about 306.0566343976.

The spelling of 28668528 in words is "twenty-eight million, six hundred sixty-eight thousand, five hundred twenty-eight".