28987584 has 112 divisors (see below), whose sum is σ = 82954368. Its totient is φ = 8900608.

The previous prime is 28987537. The next prime is 28987603. The reversal of 28987584 is 48578982.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270859 + ... + 270965.

It is an arithmetic number, because the mean of its divisors is an integer number (740664).

Almost surely, 2^28987584 is an apocalyptic number.

28987584 is a gapful number since it is divisible by the number (24) 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 28987584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41477184).

28987584 is an abundant number, since it is smaller than the sum of its proper divisors (53966784).

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

28987584 is a wasteful number, since it uses less digits than its factorization.

28987584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 212 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 51.

The square root of 28987584 is about 5384.0118870597. The cubic root of 28987584 is about 307.1878304641.

The spelling of 28987584 in words is "twenty-eight million, nine hundred eighty-seven thousand, five hundred eighty-four".