28708045 has 4 divisors (see below), whose sum is σ = 34449660. Its totient is φ = 22966432.

The previous prime is 28708039. The next prime is 28708051. The reversal of 28708045 is 54080782.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28708039) and next prime (28708051).

It can be written as a sum of positive squares in 2 ways, for example, as 3437316 + 25270729 = 1854^2 + 5027^2 .

It is a cyclic number.

It is not a de Polignac number, because 28708045 - 2¹⁷ = 28576973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28708045.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2870800 + ... + 2870809.

It is an arithmetic number, because the mean of its divisors is an integer number (8612415).

Almost surely, 2^28708045 is an apocalyptic number.

It is an amenable number.

28708045 is a deficient number, since it is larger than the sum of its proper divisors (5741615).

28708045 is an equidigital number, since it uses as much as digits as its factorization.

28708045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5741614.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 28708045 is about 5357.9888950986. The cubic root of 28708045 is about 306.1971937274.

The spelling of 28708045 in words is "twenty-eight million, seven hundred eight thousand, forty-five".