28278325 has 6 divisors (see below), whose sum is σ = 35065154. Its totient is φ = 22622640.

The previous prime is 28278301. The next prime is 28278331. The reversal of 28278325 is 52387282.

It can be written as a sum of positive squares in 3 ways, for example, as 5171076 + 23107249 = 2274^2 + 4807^2 .

It is not a de Polignac number, because 28278325 - 2¹¹ = 28276277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 565542 + ... + 565591.

Almost surely, 2^28278325 is an apocalyptic number.

28278325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28278325 is a deficient number, since it is larger than the sum of its proper divisors (6786829).

28278325 is a wasteful number, since it uses less digits than its factorization.

28278325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131143 (or 1131138 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 28278325 is about 5317.7368306452. The cubic root of 28278325 is about 304.6617229563.

The spelling of 28278325 in words is "twenty-eight million, two hundred seventy-eight thousand, three hundred twenty-five".