28901045 has 4 divisors (see below), whose sum is σ = 34681260. Its totient is φ = 23120832.

The previous prime is 28901029. The next prime is 28901057. The reversal of 28901045 is 54010982.

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 5726449 + 23174596 = 2393^2 + 4814^2 .

It is a cyclic number.

It is not a de Polignac number, because 28901045 - 2⁴ = 28901029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28900999 and 28901017.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2890100 + ... + 2890109.

It is an arithmetic number, because the mean of its divisors is an integer number (8670315).

Almost surely, 2^28901045 is an apocalyptic number.

It is an amenable number.

28901045 is a deficient number, since it is larger than the sum of its proper divisors (5780215).

28901045 is an equidigital number, since it uses as much as digits as its factorization.

28901045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5780214.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 28901045 is about 5375.9692149416. The cubic root of 28901045 is about 306.8818347912.

The spelling of 28901045 in words is "twenty-eight million, nine hundred one thousand, forty-five".