28219984 has 40 divisors (see below), whose sum is σ = 59253152. Its totient is φ = 12942720.

The previous prime is 28219973. The next prime is 28219999. The reversal of 28219984 is 48991282.

It is a self number, because there is not a number n which added to its sum of digits gives 28219984.

It is a congruent number.

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, 43567 + ... + 44209.

Almost surely, 2^28219984 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 28219984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29626576).

28219984 is an abundant number, since it is smaller than the sum of its proper divisors (31033168).

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

28219984 is a wasteful number, since it uses less digits than its factorization.

28219984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875 (or 869 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 28219984 is about 5312.2484881639. The cubic root of 28219984 is about 304.4520628842.

The spelling of 28219984 in words is "twenty-eight million, two hundred nineteen thousand, nine hundred eighty-four".