28081101 has 4 divisors (see below), whose sum is σ = 37441472. Its totient is φ = 18720732.

The previous prime is 28081099. The next prime is 28081117. The reversal of 28081101 is 10118082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28081101 - 2¹ = 28081099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4680181 + ... + 4680186.

It is an arithmetic number, because the mean of its divisors is an integer number (9360368).

Almost surely, 2^28081101 is an apocalyptic number.

It is an amenable number.

28081101 is a deficient number, since it is larger than the sum of its proper divisors (9360371).

28081101 is an equidigital number, since it uses as much as digits as its factorization.

28081101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9360370.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 28081101 is about 5299.1604051963. The cubic root of 28081101 is about 303.9517936315.

Adding to 28081101 its reverse (10118082), we get a palindrome (38199183).

It can be divided in two parts, 28081 and 101, that added together give a palindrome (28182).

The spelling of 28081101 in words is "twenty-eight million, eighty-one thousand, one hundred one".