28005845 has 16 divisors (see below), whose sum is σ = 38651520. Its totient is φ = 19082304.

The previous prime is 28005841. The next prime is 28005847. The reversal of 28005845 is 54850082.

It is a cyclic number.

It is not a de Polignac number, because 28005845 - 2² = 28005841 is a prime.

It is a super-3 number, since 3×28005845³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3251 + ... + 8159.

It is an arithmetic number, because the mean of its divisors is an integer number (2415720).

Almost surely, 2^28005845 is an apocalyptic number.

It is an amenable number.

28005845 is a deficient number, since it is larger than the sum of its proper divisors (10645675).

28005845 is a wasteful number, since it uses less digits than its factorization.

28005845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5084.

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 28005845 is about 5292.0548938952. The cubic root of 28005845 is about 303.6800253157.

The spelling of 28005845 in words is "twenty-eight million, five thousand, eight hundred forty-five".