28277109 has 12 divisors (see below), whose sum is σ = 46679776. Its totient is φ = 16158312.

The previous prime is 28277089. The next prime is 28277141. The reversal of 28277109 is 90177282.

It is not a de Polignac number, because 28277109 - 2⁷ = 28276981 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 (28277209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224359 + ... + 224484.

Almost surely, 2^28277109 is an apocalyptic number.

It is an amenable number.

28277109 is a deficient number, since it is larger than the sum of its proper divisors (18402667).

28277109 is a wasteful number, since it uses less digits than its factorization.

28277109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448856 (or 448853 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 28277109 is about 5317.6224950630. The cubic root of 28277109 is about 304.6573559606.

The spelling of 28277109 in words is "twenty-eight million, two hundred seventy-seven thousand, one hundred nine".