28509300 has 72 divisors (see below), whose sum is σ = 91660800. Its totient is φ = 7601760.

The previous prime is 28509287. The next prime is 28509311. The reversal of 28509300 is 390582.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 2580 + ... + 7979.

Almost surely, 2^28509300 is an apocalyptic number.

28509300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28509300 is an abundant number, since it is smaller than the sum of its proper divisors (63151500).

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

28509300 is a wasteful number, since it uses less digits than its factorization.

28509300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10582 (or 10569 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 28509300 is about 5339.4100797747. The cubic root of 28509300 is about 305.4889586112.

Adding to 28509300 its reverse (390582), we get a palindrome (28899882).

The spelling of 28509300 in words is "twenty-eight million, five hundred nine thousand, three hundred".