28928045 has 8 divisors (see below), whose sum is σ = 34773624. Its totient is φ = 23102464.

The previous prime is 28928023. The next prime is 28928047. The reversal of 28928045 is 54082982.

It can be written as a sum of positive squares in 4 ways, for example, as 1249924 + 27678121 = 1118^2 + 5261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28928045 - 2¹⁴ = 28911661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28928047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1604 + ... + 7773.

It is an arithmetic number, because the mean of its divisors is an integer number (4346703).

Almost surely, 2^28928045 is an apocalyptic number.

It is an amenable number.

28928045 is a deficient number, since it is larger than the sum of its proper divisors (5845579).

28928045 is an equidigital number, since it uses as much as digits as its factorization.

28928045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9999.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 28928045 is about 5378.4798038107. The cubic root of 28928045 is about 306.9773703288.

The spelling of 28928045 in words is "twenty-eight million, nine hundred twenty-eight thousand, forty-five".