28209984 has 168 divisors, whose sum is σ = 88257888. Its totient is φ = 7879680.

The previous prime is 28209977. The next prime is 28209989. The reversal of 28209984 is 48990282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28209989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 762414 + ... + 762450.

Almost surely, 2^28209984 is an apocalyptic number.

28209984 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 28209984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44128944).

28209984 is an abundant number, since it is smaller than the sum of its proper divisors (60047904).

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

28209984 is a wasteful number, since it uses less digits than its factorization.

28209984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 28209984 is about 5311.3071837355. The cubic root of 28209984 is about 304.4160968785.

It can be divided in two parts, 28 and 209984, that added together give a palindrome (210012).

The spelling of 28209984 in words is "twenty-eight million, two hundred nine thousand, nine hundred eighty-four".