28111100 has 36 divisors (see below), whose sum is σ = 61584600. Its totient is φ = 11136960.

The previous prime is 28111093. The next prime is 28111103. The reversal of 28111100 is 111182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28111103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9611 + ... + 12189.

Almost surely, 2^28111100 is an apocalyptic number.

28111100 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 28111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30792300).

28111100 is an abundant number, since it is smaller than the sum of its proper divisors (33473500).

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

28111100 is a wasteful number, since it uses less digits than its factorization.

28111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2702 (or 2695 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 28111100 is about 5301.9901923712. The cubic root of 28111100 is about 304.0599921999.

Adding to 28111100 its reverse (111182), we get a palindrome (28222282).

The spelling of 28111100 in words is "twenty-eight million, one hundred eleven thousand, one hundred".