28441109 has 4 divisors (see below), whose sum is σ = 28841760. Its totient is φ = 28040460.

The previous prime is 28441097. The next prime is 28441117. The reversal of 28441109 is 90114482.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90114482 = 2 ⋅45057241.

It is a cyclic number.

It is not a de Polignac number, because 28441109 - 2⁴ = 28441093 is a prime.

It is a super-2 number, since 2×28441109² = 1617793362299762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28441159) 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, 200219 + ... + 200360.

It is an arithmetic number, because the mean of its divisors is an integer number (7210440).

Almost surely, 2^28441109 is an apocalyptic number.

It is an amenable number.

28441109 is a deficient number, since it is larger than the sum of its proper divisors (400651).

28441109 is an equidigital number, since it uses as much as digits as its factorization.

28441109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400650.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 28441109 is about 5333.0206262493. The cubic root of 28441109 is about 305.2451992225.

The spelling of 28441109 in words is "twenty-eight million, four hundred forty-one thousand, one hundred nine".