28987328 has 28 divisors (see below), whose sum is σ = 58930032. Its totient is φ = 14138880.

The previous prime is 28987313. The next prime is 28987367. The reversal of 28987328 is 82378982.

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 3 ways as a sum of consecutive naturals, for example, 2900 + ... + 8147.

It is an arithmetic number, because the mean of its divisors is an integer number (2104644).

Almost surely, 2^28987328 is an apocalyptic number.

It is an amenable number.

28987328 is an abundant number, since it is smaller than the sum of its proper divisors (29942704).

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

28987328 is a wasteful number, since it uses less digits than its factorization.

28987328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11100 (or 11090 counting only the distinct ones).

The product of its digits is 387072, while the sum is 47.

The square root of 28987328 is about 5383.9881129141. The cubic root of 28987328 is about 307.1869261653.

The spelling of 28987328 in words is "twenty-eight million, nine hundred eighty-seven thousand, three hundred twenty-eight".