28318500 has 288 divisors, whose sum is σ = 109025280. Its totient is φ = 6048000.

The previous prime is 28318489. The next prime is 28318517. The reversal of 28318500 is 581382.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 913485 + ... + 913515.

It is an arithmetic number, because the mean of its divisors is an integer number (378560).

Almost surely, 2^28318500 is an apocalyptic number.

28318500 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 28318500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54512640).

28318500 is an abundant number, since it is smaller than the sum of its proper divisors (80706780).

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

28318500 is a wasteful number, since it uses less digits than its factorization.

28318500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28318500 is about 5321.5129427636. The cubic root of 28318500 is about 304.8059322631.

Adding to 28318500 its reverse (581382), we get a palindrome (28899882).

The spelling of 28318500 in words is "twenty-eight million, three hundred eighteen thousand, five hundred".