28605785 has 24 divisors (see below), whose sum is σ = 37661400. Its totient is φ = 20846592.

The previous prime is 28605769. The next prime is 28605799. The reversal of 28605785 is 58750682.

It can be written as a sum of positive squares in 12 ways, for example, as 13520329 + 15085456 = 3677^2 + 3884^2 .

It is not a de Polignac number, because 28605785 - 2⁴ = 28605769 is a prime.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81791 + ... + 82139.

It is an arithmetic number, because the mean of its divisors is an integer number (1569225).

Almost surely, 2^28605785 is an apocalyptic number.

It is an amenable number.

28605785 is a deficient number, since it is larger than the sum of its proper divisors (9055615).

28605785 is a wasteful number, since it uses less digits than its factorization.

28605785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 28605785 is about 5348.4376223342. The cubic root of 28605785 is about 305.8331961448.

The spelling of 28605785 in words is "twenty-eight million, six hundred five thousand, seven hundred eighty-five".