28403500 has 24 divisors (see below), whose sum is σ = 62034336. Its totient is φ = 11361200.

The previous prime is 28403489. The next prime is 28403503. The reversal of 28403500 is 530482.

It is not an unprimeable number, because it can be changed into a prime (28403503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27904 + ... + 28903.

It is an arithmetic number, because the mean of its divisors is an integer number (2584764).

Almost surely, 2^28403500 is an apocalyptic number.

28403500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28403500 is an abundant number, since it is smaller than the sum of its proper divisors (33630836).

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

28403500 is a wasteful number, since it uses less digits than its factorization.

28403500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56826 (or 56814 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 28403500 is about 5329.4934093214. The cubic root of 28403500 is about 305.1105932363.

Adding to 28403500 its reverse (530482), we get a palindrome (28933982).

The spelling of 28403500 in words is "twenty-eight million, four hundred three thousand, five hundred".