28185984 has 96 divisors (see below), whose sum is σ = 83140200. Its totient is φ = 9160704.

The previous prime is 28185959. The next prime is 28186009. The reversal of 28185984 is 48958182.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28185959) and next prime (28186009).

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

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, 49252 + ... + 49820.

Almost surely, 2^28185984 is an apocalyptic number.

28185984 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 28185984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41570100).

28185984 is an abundant number, since it is smaller than the sum of its proper divisors (54954216).

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

28185984 is a wasteful number, since it uses less digits than its factorization.

28185984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632 (or 617 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 28185984 is about 5309.0473721752. The cubic root of 28185984 is about 304.3297437728.

The spelling of 28185984 in words is "twenty-eight million, one hundred eighty-five thousand, nine hundred eighty-four".