28381984 has 48 divisors (see below), whose sum is σ = 57915648. Its totient is φ = 13683712.

The previous prime is 28381973. The next prime is 28382017. The reversal of 28381984 is 48918382.

It is a self number, because there is not a number n which added to its sum of digits gives 28381984.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169869 + ... + 170035.

It is an arithmetic number, because the mean of its divisors is an integer number (1206576).

Almost surely, 2^28381984 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 28381984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28957824).

28381984 is an abundant number, since it is smaller than the sum of its proper divisors (29533664).

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

28381984 is a wasteful number, since it uses less digits than its factorization.

28381984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 329 counting only the distinct ones).

The product of its digits is 110592, while the sum is 43.

The square root of 28381984 is about 5327.4744485544. The cubic root of 28381984 is about 305.0335321012.

The spelling of 28381984 in words is "twenty-eight million, three hundred eighty-one thousand, nine hundred eighty-four".