28114505 has 4 divisors (see below), whose sum is σ = 33737412. Its totient is φ = 22491600.

The previous prime is 28114501. The next prime is 28114517. The reversal of 28114505 is 50541182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4426816 + 23687689 = 2104^2 + 4867^2 .

It is not a de Polignac number, because 28114505 - 2² = 28114501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28114501) 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, 2811446 + ... + 2811455.

It is an arithmetic number, because the mean of its divisors is an integer number (8434353).

Almost surely, 2^28114505 is an apocalyptic number.

It is an amenable number.

28114505 is a deficient number, since it is larger than the sum of its proper divisors (5622907).

28114505 is an equidigital number, since it uses as much as digits as its factorization.

28114505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5622906.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 28114505 is about 5302.3112884854. The cubic root of 28114505 is about 304.0722682815.

Adding to 28114505 its reverse (50541182), we get a palindrome (78655687).

The spelling of 28114505 in words is "twenty-eight million, one hundred fourteen thousand, five hundred five".