28561045 has 4 divisors (see below), whose sum is σ = 34273260. Its totient is φ = 22848832.

The previous prime is 28561019. The next prime is 28561063. The reversal of 28561045 is 54016582.

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 12895281 + 15665764 = 3591^2 + 3958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28561045 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 28560998 and 28561016.

It is a congruent 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, 2856100 + ... + 2856109.

It is an arithmetic number, because the mean of its divisors is an integer number (8568315).

Almost surely, 2^28561045 is an apocalyptic number.

It is an amenable number.

28561045 is a deficient number, since it is larger than the sum of its proper divisors (5712215).

28561045 is an equidigital number, since it uses as much as digits as its factorization.

28561045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5712214.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 28561045 is about 5344.2534558159. The cubic root of 28561045 is about 305.6736699408.

The spelling of 28561045 in words is "twenty-eight million, five hundred sixty-one thousand, forty-five".