28909104 has 80 divisors (see below), whose sum is σ = 86327808. Its totient is φ = 8165376.

The previous prime is 28909103. The next prime is 28909109. The reversal of 28909104 is 40190982.

It is not an unprimeable number, because it can be changed into a prime (28909103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32149 + ... + 33035.

Almost surely, 2^28909104 is an apocalyptic number.

28909104 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 28909104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43163904).

28909104 is an abundant number, since it is smaller than the sum of its proper divisors (57418704).

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

28909104 is a wasteful number, since it uses less digits than its factorization.

28909104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002 (or 996 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 28909104 is about 5376.7187019594. The cubic root of 28909104 is about 306.9103566072.

The spelling of 28909104 in words is "twenty-eight million, nine hundred nine thousand, one hundred four".