28223100 has 72 divisors (see below), whose sum is σ = 90740720. Its totient is φ = 7525440.

The previous prime is 28223099. The next prime is 28223123. The reversal of 28223100 is 132282.

It is a happy number.

It is a super-2 number, since 2×28223100² = 1593086747220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2527 + ... + 7926.

Almost surely, 2^28223100 is an apocalyptic number.

28223100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28223100 is an abundant number, since it is smaller than the sum of its proper divisors (62517620).

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

28223100 is a wasteful number, since it uses less digits than its factorization.

28223100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10476 (or 10463 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 28223100 is about 5312.5417645417. The cubic root of 28223100 is about 304.4632681553.

Adding to 28223100 its reverse (132282), we get a palindrome (28355382).

The spelling of 28223100 in words is "twenty-eight million, two hundred twenty-three thousand, one hundred".