28491104 has 48 divisors (see below), whose sum is σ = 58051728. Its totient is φ = 13757952.

The previous prime is 28491103. The next prime is 28491143. The reversal of 28491104 is 40119482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28491101) 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 7 ways as a sum of consecutive naturals, for example, 181394 + ... + 181550.

It is an arithmetic number, because the mean of its divisors is an integer number (1209411).

Almost surely, 2^28491104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28491104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29025864).

28491104 is an abundant number, since it is smaller than the sum of its proper divisors (29560624).

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

28491104 is a wasteful number, since it uses less digits than its factorization.

28491104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 28491104 is about 5337.7058742497. The cubic root of 28491104 is about 305.4239522201.

The spelling of 28491104 in words is "twenty-eight million, four hundred ninety-one thousand, one hundred four".