28985904 has 80 divisors (see below), whose sum is σ = 83848800. Its totient is φ = 9586944.

The previous prime is 28985903. The next prime is 28985921. The reversal of 28985904 is 40958982.

It is a self number, because there is not a number n which added to its sum of digits gives 28985904.

It is not an unprimeable number, because it can be changed into a prime (28985903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98782 + ... + 99074.

It is an arithmetic number, because the mean of its divisors is an integer number (1048110).

Almost surely, 2^28985904 is an apocalyptic number.

28985904 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 28985904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41924400).

28985904 is an abundant number, since it is smaller than the sum of its proper divisors (54862896).

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

28985904 is a wasteful number, since it uses less digits than its factorization.

28985904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 28985904 is about 5383.8558673129. The cubic root of 28985904 is about 307.1818959058.

The spelling of 28985904 in words is "twenty-eight million, nine hundred eighty-five thousand, nine hundred four".