28061109 has 6 divisors (see below), whose sum is σ = 40532726. Its totient is φ = 18707400.

The previous prime is 28061093. The next prime is 28061123. The reversal of 28061109 is 90116082.

It can be written as a sum of positive squares in only one way, i.e., 20277009 + 7784100 = 4503^2 + 2790^2 .

It is not a de Polignac number, because 28061109 - 2⁴ = 28061093 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 (28062109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1558942 + ... + 1558959.

Almost surely, 2^28061109 is an apocalyptic number.

It is an amenable number.

28061109 is a deficient number, since it is larger than the sum of its proper divisors (12471617).

28061109 is a wasteful number, since it uses less digits than its factorization.

28061109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117907 (or 3117904 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 28061109 is about 5297.2737327799. The cubic root of 28061109 is about 303.8796449067.

The spelling of 28061109 in words is "twenty-eight million, sixty-one thousand, one hundred nine".