28787584 has 96 divisors (see below), whose sum is σ = 69951600. Its totient is φ = 11556864.

The previous prime is 28787569. The next prime is 28787587. The reversal of 28787584 is 48578782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28787587) 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 11 ways as a sum of consecutive naturals, for example, 323412 + ... + 323500.

Almost surely, 2^28787584 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 28787584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34975800).

28787584 is an abundant number, since it is smaller than the sum of its proper divisors (41164016).

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

28787584 is an equidigital number, since it uses as much as digits as its factorization.

28787584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 117 counting only the distinct ones).

The product of its digits is 1003520, while the sum is 49.

The square root of 28787584 is about 5365.4062287957. The cubic root of 28787584 is about 306.4797180245.

The spelling of 28787584 in words is "twenty-eight million, seven hundred eighty-seven thousand, five hundred eighty-four".