28085945 has 4 divisors (see below), whose sum is σ = 33703140. Its totient is φ = 22468752.

The previous prime is 28085929. The next prime is 28085957. The reversal of 28085945 is 54958082.

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 22306729 + 5779216 = 4723^2 + 2404^2 .

It is a cyclic number.

It is not a de Polignac number, because 28085945 - 2⁴ = 28085929 is a prime.

It is a super-3 number, since 3×28085945³ (a number of 23 digits) contains 333 as substring.

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, 2808590 + ... + 2808599.

It is an arithmetic number, because the mean of its divisors is an integer number (8425785).

Almost surely, 2^28085945 is an apocalyptic number.

It is an amenable number.

28085945 is a deficient number, since it is larger than the sum of its proper divisors (5617195).

28085945 is an equidigital number, since it uses as much as digits as its factorization.

28085945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5617194.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 28085945 is about 5299.6174390233. The cubic root of 28085945 is about 303.9692698912.

The spelling of 28085945 in words is "twenty-eight million, eighty-five thousand, nine hundred forty-five".