9728505 has 56 divisors (see below), whose sum is σ = 18650952. Its totient is φ = 4852224.

The previous prime is 9728503. The next prime is 9728519. The reversal of 9728505 is 5058279.

It can be written as a sum of positive squares in 4 ways, for example, as 1225449 + 8503056 = 1107^2 + 2916^2 .

It is not a de Polignac number, because 9728505 - 2¹ = 9728503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9728505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9728503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 61887 + ... + 62043.

Almost surely, 2^9728505 is an apocalyptic number.

It is an amenable number.

9728505 is a deficient number, since it is larger than the sum of its proper divisors (8922447).

9728505 is a wasteful number, since it uses less digits than its factorization.

9728505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 9728505 is about 3119.0551453926. The cubic root of 9728505 is about 213.4758257561.

The spelling of 9728505 in words is "nine million, seven hundred twenty-eight thousand, five hundred five".