28928520 has 96 divisors (see below), whose sum is σ = 95022720. Its totient is φ = 7632000.

The previous prime is 28928519. The next prime is 28928531. The reversal of 28928520 is 2582982.

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

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 38145 + ... + 38895.

It is an arithmetic number, because the mean of its divisors is an integer number (989820).

Almost surely, 2^28928520 is an apocalyptic number.

28928520 is a gapful number since it is divisible by the number (20) 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 28928520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47511360).

28928520 is an abundant number, since it is smaller than the sum of its proper divisors (66094200).

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

28928520 is a wasteful number, since it uses less digits than its factorization.

28928520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28928520 is about 5378.5239610882. The cubic root of 28928520 is about 306.9790505144.

The spelling of 28928520 in words is "twenty-eight million, nine hundred twenty-eight thousand, five hundred twenty".