28223300 has 72 divisors (see below), whose sum is σ = 73078656. Its totient is φ = 9250560.

The previous prime is 28223263. The next prime is 28223311. The reversal of 28223300 is 332282.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 15224 + ... + 16976.

Almost surely, 2^28223300 is an apocalyptic number.

28223300 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 28223300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36539328).

28223300 is an abundant number, since it is smaller than the sum of its proper divisors (44855356).

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

28223300 is a wasteful number, since it uses less digits than its factorization.

28223300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1797 (or 1790 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 28223300 is about 5312.5605878898. The cubic root of 28223300 is about 304.4639873358.

Adding to 28223300 its reverse (332282), we get a palindrome (28555582).

The spelling of 28223300 in words is "twenty-eight million, two hundred twenty-three thousand, three hundred".