28191110100 has 36 divisors (see below), whose sum is σ = 81566279424. Its totient is φ = 7517629280.

The previous prime is 28191110099. The next prime is 28191110113. The reversal of 28191110100 is 101119182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46984884 + ... + 46985483.

It is an arithmetic number, because the mean of its divisors is an integer number (2265729984).

Almost surely, 2^28191110100 is an apocalyptic number.

28191110100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28191110100 is an abundant number, since it is smaller than the sum of its proper divisors (53375169324).

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

28191110100 is a wasteful number, since it uses less digits than its factorization.

28191110100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93970384 (or 93970377 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 24.

Adding to 28191110100 its reverse (101119182), we get a palindrome (28292229282).

The spelling of 28191110100 in words is "twenty-eight billion, one hundred ninety-one million, one hundred ten thousand, one hundred".