28504500 has 96 divisors (see below), whose sum is σ = 85822464. Its totient is φ = 7344000.

The previous prime is 28504499. The next prime is 28504501. The reversal of 28504500 is 540582.

It is an interprime number because it is at equal distance from previous prime (28504499) and next prime (28504501).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28504501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46194 + ... + 46806.

It is an arithmetic number, because the mean of its divisors is an integer number (893984).

Almost surely, 2^28504500 is an apocalyptic number.

28504500 is a gapful number since it is divisible by the number (20) 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 28504500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42911232).

28504500 is an abundant number, since it is smaller than the sum of its proper divisors (57317964).

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

28504500 is a wasteful number, since it uses less digits than its factorization.

28504500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 28504500 is about 5338.9605729955. The cubic root of 28504500 is about 305.4718129862.

The spelling of 28504500 in words is "twenty-eight million, five hundred four thousand, five hundred".