6533540 has 36 divisors (see below), whose sum is σ = 14864724. Its totient is φ = 2411136.

The previous prime is 6533509. The next prime is 6533561. The reversal of 6533540 is 453356.

It can be written as a sum of positive squares in 6 ways, for example, as 850084 + 5683456 = 922^2 + 2384^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

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 11 ways as a sum of consecutive naturals, for example, 2414 + ... + 4346.

It is an arithmetic number, because the mean of its divisors is an integer number (412909).

Almost surely, 2^6533540 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 6533540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7432362).

6533540 is an abundant number, since it is smaller than the sum of its proper divisors (8331184).

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

6533540 is a wasteful number, since it uses less digits than its factorization.

6533540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1968 (or 1953 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 6533540 is about 2556.0790285122. The cubic root of 6533540 is about 186.9460032646.

Adding to 6533540 its reverse (453356), we get a palindrome (6986896).

The spelling of 6533540 in words is "six million, five hundred thirty-three thousand, five hundred forty".