28023100 has 144 divisors (see below), whose sum is σ = 76384000. Its totient is φ = 8890560.

The previous prime is 28023091. The next prime is 28023103. The reversal of 28023100 is 132082.

It is a happy number.

It is a super-2 number, since 2×28023100² = 1570588267220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28023103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 651679 + ... + 651721.

Almost surely, 2^28023100 is an apocalyptic number.

28023100 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 28023100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38192000).

28023100 is an abundant number, since it is smaller than the sum of its proper divisors (48360900).

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

28023100 is a wasteful number, since it uses less digits than its factorization.

28023100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 28023100 is about 5293.6849169553. The cubic root of 28023100 is about 303.7423804306.

Adding to 28023100 its reverse (132082), we get a palindrome (28155182).

The spelling of 28023100 in words is "twenty-eight million, twenty-three thousand, one hundred".