28308504 has 64 divisors (see below), whose sum is σ = 81446400. Its totient is φ = 8031744.

The previous prime is 28308503. The next prime is 28308517. The reversal of 28308504 is 40580382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28308503) 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, 27552 + ... + 28560.

It is an arithmetic number, because the mean of its divisors is an integer number (1272600).

Almost surely, 2^28308504 is an apocalyptic number.

28308504 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 28308504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40723200).

28308504 is an abundant number, since it is smaller than the sum of its proper divisors (53137896).

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

28308504 is a wasteful number, since it uses less digits than its factorization.

28308504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192 (or 1188 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 28308504 is about 5320.5736532821. The cubic root of 28308504 is about 304.7700640890.

Adding to 28308504 its reverse (40580382), we get a palindrome (68888886).

The spelling of 28308504 in words is "twenty-eight million, three hundred eight thousand, five hundred four".