28218300 has 144 divisors (see below), whose sum is σ = 94493952. Its totient is φ = 6425600.

The previous prime is 28218293. The next prime is 28218319. The reversal of 28218300 is 381282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55849 + ... + 56351.

It is an arithmetic number, because the mean of its divisors is an integer number (656208).

Almost surely, 2^28218300 is an apocalyptic number.

28218300 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 28218300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47246976).

28218300 is an abundant number, since it is smaller than the sum of its proper divisors (66275652).

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

28218300 is a wasteful number, since it uses less digits than its factorization.

28218300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 28218300 is about 5312.0899841776. The cubic root of 28218300 is about 304.4460068038.

Adding to 28218300 its reverse (381282), we get a palindrome (28599582).

The spelling of 28218300 in words is "twenty-eight million, two hundred eighteen thousand, three hundred".