28532905 has 4 divisors (see below), whose sum is σ = 34239492. Its totient is φ = 22826320.

The previous prime is 28532899. The next prime is 28532929. The reversal of 28532905 is 50923582.

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 4247721 + 24285184 = 2061^2 + 4928^2 .

It is not a de Polignac number, because 28532905 - 2⁵ = 28532873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2853286 + ... + 2853295.

It is an arithmetic number, because the mean of its divisors is an integer number (8559873).

Almost surely, 2^28532905 is an apocalyptic number.

It is an amenable number.

28532905 is a deficient number, since it is larger than the sum of its proper divisors (5706587).

28532905 is an equidigital number, since it uses as much as digits as its factorization.

28532905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5706586.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 28532905 is about 5341.6200725997. The cubic root of 28532905 is about 305.5732478032.

The spelling of 28532905 in words is "twenty-eight million, five hundred thirty-two thousand, nine hundred five".