6531240 has 64 divisors (see below), whose sum is σ = 20136960. Its totient is φ = 1693440.

The previous prime is 6531233. The next prime is 6531251. The reversal of 6531240 is 421356.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3705 + ... + 5175.

It is an arithmetic number, because the mean of its divisors is an integer number (314640).

Almost surely, 2^6531240 is an apocalyptic number.

6531240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6531240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10068480).

6531240 is an abundant number, since it is smaller than the sum of its proper divisors (13605720).

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

6531240 is a wasteful number, since it uses less digits than its factorization.

6531240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522 (or 1518 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 6531240 is about 2555.6290810679. The cubic root of 6531240 is about 186.9240638427.

Adding to 6531240 its reverse (421356), we get a palindrome (6952596).

The spelling of 6531240 in words is "six million, five hundred thirty-one thousand, two hundred forty".