28111145 has 8 divisors (see below), whose sum is σ = 33826056. Its totient is φ = 22427136.

The previous prime is 28111133. The next prime is 28111151. The reversal of 28111145 is 54111182.

It can be written as a sum of positive squares in 4 ways, for example, as 3031081 + 25080064 = 1741^2 + 5008^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28111145 - 2¹⁶ = 28045609 is a prime.

It is a super-2 number, since 2×28111145² = 1580472946422050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28111145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5672 + ... + 9401.

It is an arithmetic number, because the mean of its divisors is an integer number (4228257).

Almost surely, 2^28111145 is an apocalyptic number.

It is an amenable number.

28111145 is a deficient number, since it is larger than the sum of its proper divisors (5714911).

28111145 is a wasteful number, since it uses less digits than its factorization.

28111145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15451.

The product of its digits is 320, while the sum is 23.

The square root of 28111145 is about 5301.9944360589. The cubic root of 28111145 is about 304.0601544453.

The spelling of 28111145 in words is "twenty-eight million, one hundred eleven thousand, one hundred forty-five".