28748904 has 64 divisors (see below), whose sum is σ = 78589440. Its totient is φ = 8724480.

The previous prime is 28748903. The next prime is 28748911. The reversal of 28748904 is 40984782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28748903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11512 + ... + 13784.

It is an arithmetic number, because the mean of its divisors is an integer number (1227960).

Almost surely, 2^28748904 is an apocalyptic number.

28748904 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 28748904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39294720).

28748904 is an abundant number, since it is smaller than the sum of its proper divisors (49840536).

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

28748904 is a wasteful number, since it uses less digits than its factorization.

28748904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330 (or 2326 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28748904 is about 5361.8004438808. The cubic root of 28748904 is about 306.3423908942.

The spelling of 28748904 in words is "twenty-eight million, seven hundred forty-eight thousand, nine hundred four".