28505145 has 16 divisors (see below), whose sum is σ = 45751680. Its totient is φ = 15154944.

The previous prime is 28505093. The next prime is 28505153. The reversal of 28505145 is 54150582.

It is not a de Polignac number, because 28505145 - 2⁹ = 28504633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2236 + ... + 7874.

It is an arithmetic number, because the mean of its divisors is an integer number (2859480).

Almost surely, 2^28505145 is an apocalyptic number.

It is an amenable number.

28505145 is a deficient number, since it is larger than the sum of its proper divisors (17246535).

28505145 is a wasteful number, since it uses less digits than its factorization.

28505145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5984.

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 28505145 is about 5339.0209776700. The cubic root of 28505145 is about 305.4741170415.

The spelling of 28505145 in words is "twenty-eight million, five hundred five thousand, one hundred forty-five".