28192145 has 4 divisors (see below), whose sum is σ = 33830580. Its totient is φ = 22553712.

The previous prime is 28192139. The next prime is 28192159. The reversal of 28192145 is 54129182.

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 13454224 + 14737921 = 3668^2 + 3839^2 .

It is a cyclic number.

It is not a de Polignac number, because 28192145 - 2⁶ = 28192081 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 2819210 + ... + 2819219.

It is an arithmetic number, because the mean of its divisors is an integer number (8457645).

Almost surely, 2^28192145 is an apocalyptic number.

It is an amenable number.

28192145 is a deficient number, since it is larger than the sum of its proper divisors (5638435).

28192145 is an equidigital number, since it uses as much as digits as its factorization.

28192145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5638434.

The product of its digits is 5760, while the sum is 32.

The square root of 28192145 is about 5309.6275763937. The cubic root of 28192145 is about 304.3519160098.

The spelling of 28192145 in words is "twenty-eight million, one hundred ninety-two thousand, one hundred forty-five".