28365605 has 8 divisors (see below), whose sum is σ = 36041112. Its totient is φ = 21357568.

The previous prime is 28365587. The next prime is 28365611. The reversal of 28365605 is 50656382.

It can be written as a sum of positive squares in 4 ways, for example, as 14984641 + 13380964 = 3871^2 + 3658^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28365605 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166772 + ... + 166941.

It is an arithmetic number, because the mean of its divisors is an integer number (4505139).

Almost surely, 2^28365605 is an apocalyptic number.

It is an amenable number.

28365605 is a deficient number, since it is larger than the sum of its proper divisors (7675507).

28365605 is a wasteful number, since it uses less digits than its factorization.

28365605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333735.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 28365605 is about 5325.9370067623. The cubic root of 28365605 is about 304.9748433968.

The spelling of 28365605 in words is "twenty-eight million, three hundred sixty-five thousand, six hundred five".