28389984 has 96 divisors (see below), whose sum is σ = 86365440. Its totient is φ = 7997952.

The previous prime is 28389979. The next prime is 28390001. The reversal of 28389984 is 48998382.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 55522 + ... + 56030.

It is an arithmetic number, because the mean of its divisors is an integer number (899640).

Almost surely, 2^28389984 is an apocalyptic number.

28389984 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 28389984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43182720).

28389984 is an abundant number, since it is smaller than the sum of its proper divisors (57975456).

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

28389984 is a wasteful number, since it uses less digits than its factorization.

28389984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 604 counting only the distinct ones).

The product of its digits is 995328, while the sum is 51.

The square root of 28389984 is about 5328.2252204651. The cubic root of 28389984 is about 305.0621892359.

The spelling of 28389984 in words is "twenty-eight million, three hundred eighty-nine thousand, nine hundred eighty-four".