28380500 has 48 divisors (see below), whose sum is σ = 64017408. Its totient is φ = 10980000.

The previous prime is 28380479. The next prime is 28380523. The reversal of 28380500 is 508382.

It is a self number, because there is not a number n which added to its sum of digits gives 28380500.

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 15 ways as a sum of consecutive naturals, for example, 14585 + ... + 16415.

It is an arithmetic number, because the mean of its divisors is an integer number (1333696).

Almost surely, 2^28380500 is an apocalyptic number.

28380500 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 28380500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32008704).

28380500 is an abundant number, since it is smaller than the sum of its proper divisors (35636908).

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

28380500 is a wasteful number, since it uses less digits than its factorization.

28380500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881 (or 1869 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 28380500 is about 5327.3351687312. The cubic root of 28380500 is about 305.0282156106.

Adding to 28380500 its reverse (508382), we get a palindrome (28888882).

The spelling of 28380500 in words is "twenty-eight million, three hundred eighty thousand, five hundred".