28591104 has 88 divisors (see below), whose sum is σ = 78408288. Its totient is φ = 9256960.

The previous prime is 28591103. The next prime is 28591151. The reversal of 28591104 is 40119582.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28591103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125839 + ... + 126065.

Almost surely, 2^28591104 is an apocalyptic number.

28591104 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 28591104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39204144).

28591104 is an abundant number, since it is smaller than the sum of its proper divisors (49817184).

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

28591104 is a wasteful number, since it uses less digits than its factorization.

28591104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 28591104 is about 5347.0649893189. The cubic root of 28591104 is about 305.7808675048.

The spelling of 28591104 in words is "twenty-eight million, five hundred ninety-one thousand, one hundred four".