6531320240 has 40 divisors (see below), whose sum is σ = 15200128320. Its totient is φ = 2609980416.

The previous prime is 6531320239. The next prime is 6531320251. The reversal of 6531320240 is 420231356.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43832 + ... + 122408.

It is an arithmetic number, because the mean of its divisors is an integer number (380003208).

Almost surely, 2^6531320240 is an apocalyptic number.

It is an amenable number.

6531320240 is an abundant number, since it is smaller than the sum of its proper divisors (8668808080).

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

6531320240 is a wasteful number, since it uses less digits than its factorization.

6531320240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79629 (or 79623 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 6531320240 is about 80816.5839416639. The cubic root of 6531320240 is about 1869.2482932904.

Adding to 6531320240 its reverse (420231356), we get a palindrome (6951551596).

The spelling of 6531320240 in words is "six billion, five hundred thirty-one million, three hundred twenty thousand, two hundred forty".