28385505 has 16 divisors (see below), whose sum is σ = 50463360. Its totient is φ = 15138864.

The previous prime is 28385503. The next prime is 28385521. The reversal of 28385505 is 50558382.

It is not a de Polignac number, because 28385505 - 2¹ = 28385503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28385505.

It is not an unprimeable number, because it can be changed into a prime (28385501) 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, 104997 + ... + 105266.

It is an arithmetic number, because the mean of its divisors is an integer number (3153960).

Almost surely, 2^28385505 is an apocalyptic number.

It is an amenable number.

28385505 is a deficient number, since it is larger than the sum of its proper divisors (22077855).

28385505 is a wasteful number, since it uses less digits than its factorization.

28385505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210277 (or 210271 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 28385505 is about 5327.8048950764. The cubic root of 28385505 is about 305.0461454860.

The spelling of 28385505 in words is "twenty-eight million, three hundred eighty-five thousand, five hundred five".