28006100 has 18 divisors (see below), whose sum is σ = 60773454. Its totient is φ = 11202400.

The previous prime is 28006093. The next prime is 28006129. The reversal of 28006100 is 160082.

It can be written as a sum of positive squares in 3 ways, for example, as 3225616 + 24780484 = 1796^2 + 4978^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139931 + ... + 140130.

It is an arithmetic number, because the mean of its divisors is an integer number (3376303).

Almost surely, 2^28006100 is an apocalyptic number.

28006100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28006100 is an abundant number, since it is smaller than the sum of its proper divisors (32767354).

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

28006100 is a wasteful number, since it uses less digits than its factorization.

28006100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280075 (or 280068 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 28006100 is about 5292.0789865610. The cubic root of 28006100 is about 303.6809470063.

Adding to 28006100 its reverse (160082), we get a palindrome (28166182).

The spelling of 28006100 in words is "twenty-eight million, six thousand, one hundred".