28075745 has 4 divisors (see below), whose sum is σ = 33690900. Its totient is φ = 22460592.

The previous prime is 28075717. The next prime is 28075753. The reversal of 28075745 is 54757082.

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 3701776 + 24373969 = 1924^2 + 4937^2 .

It is a cyclic number.

It is not a de Polignac number, because 28075745 - 2¹⁶ = 28010209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28075699 and 28075708.

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, 2807570 + ... + 2807579.

It is an arithmetic number, because the mean of its divisors is an integer number (8422725).

Almost surely, 2^28075745 is an apocalyptic number.

It is an amenable number.

28075745 is a deficient number, since it is larger than the sum of its proper divisors (5615155).

28075745 is an equidigital number, since it uses as much as digits as its factorization.

28075745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5615154.

The product of its (nonzero) digits is 78400, while the sum is 38.

The square root of 28075745 is about 5298.6550180211. The cubic root of 28075745 is about 303.9324678304.

The spelling of 28075745 in words is "twenty-eight million, seventy-five thousand, seven hundred forty-five".