28273145 has 16 divisors (see below), whose sum is σ = 35069760. Its totient is φ = 21868224.

The previous prime is 28273117. The next prime is 28273171. The reversal of 28273145 is 54137282.

It is a cyclic number.

It is not a de Polignac number, because 28273145 - 2⁸ = 28272889 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 22391 + ... + 23619.

It is an arithmetic number, because the mean of its divisors is an integer number (2191860).

Almost surely, 2^28273145 is an apocalyptic number.

It is an amenable number.

28273145 is a deficient number, since it is larger than the sum of its proper divisors (6796615).

28273145 is a wasteful number, since it uses less digits than its factorization.

28273145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384.

The product of its digits is 13440, while the sum is 32.

The square root of 28273145 is about 5317.2497590390. The cubic root of 28273145 is about 304.6431192601.

The spelling of 28273145 in words is "twenty-eight million, two hundred seventy-three thousand, one hundred forty-five".