28504104 has 64 divisors (see below), whose sum is σ = 79444800. Its totient is φ = 8469504.

The previous prime is 28504081. The next prime is 28504111. The reversal of 28504104 is 40140582.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

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, 5914 + ... + 9590.

It is an arithmetic number, because the mean of its divisors is an integer number (1241325).

Almost surely, 2^28504104 is an apocalyptic number.

28504104 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 28504104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39722400).

28504104 is an abundant number, since it is smaller than the sum of its proper divisors (50940696).

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

28504104 is a wasteful number, since it uses less digits than its factorization.

28504104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722 (or 3718 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 28504104 is about 5338.9234869962. The cubic root of 28504104 is about 305.4703983862.

Adding to 28504104 its reverse (40140582), we get a palindrome (68644686).

It can be divided in two parts, 2850 and 4104, that multiplied together give a square (11696400 = 3420²).

The spelling of 28504104 in words is "twenty-eight million, five hundred four thousand, one hundred four".