28387528 has 32 divisors (see below), whose sum is σ = 57879360. Its totient is φ = 12974400.

The previous prime is 28387523. The next prime is 28387531. The reversal of 28387528 is 82578382.

It is not an unprimeable number, because it can be changed into a prime (28387523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9853 + ... + 12403.

It is an arithmetic number, because the mean of its divisors is an integer number (1808730).

Almost surely, 2^28387528 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 28387528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28939680).

28387528 is an abundant number, since it is smaller than the sum of its proper divisors (29491832).

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

28387528 is a wasteful number, since it uses less digits than its factorization.

28387528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677 (or 2673 counting only the distinct ones).

The product of its digits is 215040, while the sum is 43.

The square root of 28387528 is about 5327.9947447422. The cubic root of 28387528 is about 305.0533920682.

The spelling of 28387528 in words is "twenty-eight million, three hundred eighty-seven thousand, five hundred twenty-eight".