28145845 has 24 divisors (see below), whose sum is σ = 42316344. Its totient is φ = 17813376.

The previous prime is 28145839. The next prime is 28145849. The reversal of 28145845 is 54854182.

It can be written as a sum of positive squares in 4 ways, for example, as 6671889 + 21473956 = 2583^2 + 4634^2 .

It is not a de Polignac number, because 28145845 - 2⁷ = 28145717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28145849) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1234 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (1763181).

Almost surely, 2^28145845 is an apocalyptic number.

It is an amenable number.

28145845 is a deficient number, since it is larger than the sum of its proper divisors (14170499).

28145845 is a wasteful number, since it uses less digits than its factorization.

28145845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8869 (or 8862 counting only the distinct ones).

The product of its digits is 51200, while the sum is 37.

The square root of 28145845 is about 5305.2657803356. The cubic root of 28145845 is about 304.1852121884.

The spelling of 28145845 in words is "twenty-eight million, one hundred forty-five thousand, eight hundred forty-five".