28503200 has 144 divisors (see below), whose sum is σ = 78744960. Its totient is φ = 9984000.

The previous prime is 28503199. The next prime is 28503221. The reversal of 28503200 is 230582.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 360761 + ... + 360839.

It is an arithmetic number, because the mean of its divisors is an integer number (546840).

Almost surely, 2^28503200 is an apocalyptic number.

28503200 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 28503200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39372480).

28503200 is an abundant number, since it is smaller than the sum of its proper divisors (50241760).

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

28503200 is a wasteful number, since it uses less digits than its factorization.

28503200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 28503200 is about 5338.8388250630. The cubic root of 28503200 is about 305.4671690481.

Adding to 28503200 its reverse (230582), we get a palindrome (28733782).

The spelling of 28503200 in words is "twenty-eight million, five hundred three thousand, two hundred".