6539728 has 40 divisors (see below), whose sum is σ = 14249088. Its totient is φ = 2884992.

The previous prime is 6539719. The next prime is 6539777. The reversal of 6539728 is 8279356.

It is a d-powerful number, because it can be written as 6⁸ + 5⁶ + 3¹⁴ + 9⁵ + 7⁴ + 2² + 8² .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4101 + ... + 5467.

Almost surely, 2^6539728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6539728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7124544).

6539728 is an abundant number, since it is smaller than the sum of its proper divisors (7709360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6539728 is a wasteful number, since it uses less digits than its factorization.

6539728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411 (or 1405 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 6539728 is about 2557.2891897476. The cubic root of 6539728 is about 187.0050042986.

It can be divided in two parts, 65 and 39728, that added together give a palindrome (39793).

The spelling of 6539728 in words is "six million, five hundred thirty-nine thousand, seven hundred twenty-eight".