28329984 has 144 divisors (see below), whose sum is σ = 86240700. Its totient is φ = 8945664.

The previous prime is 28329967. The next prime is 28330009. The reversal of 28329984 is 48992382.

28329984 is a `hidden beast` number, since 283 + 299 + 84 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27878400 + 451584 = 5280^2 + 672^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 534502 + ... + 534554.

Almost surely, 2^28329984 is an apocalyptic number.

28329984 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 28329984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43120350).

28329984 is an abundant number, since it is smaller than the sum of its proper divisors (57910716).

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

28329984 is a wasteful number, since it uses less digits than its factorization.

28329984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 87 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 28329984 is about 5322.5918498416. The cubic root of 28329984 is about 304.8471293399.

The spelling of 28329984 in words is "twenty-eight million, three hundred twenty-nine thousand, nine hundred eighty-four".