6513640 has 64 divisors (see below), whose sum is σ = 17170560. Its totient is φ = 2177280.

The previous prime is 6513613. The next prime is 6513649. The reversal of 6513640 is 463156.

It is not an unprimeable number, because it can be changed into a prime (6513649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11770 + ... + 12310.

It is an arithmetic number, because the mean of its divisors is an integer number (268290).

Almost surely, 2^6513640 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 6513640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8585280).

6513640 is an abundant number, since it is smaller than the sum of its proper divisors (10656920).

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

6513640 is a wasteful number, since it uses less digits than its factorization.

6513640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 6513640 is about 2552.1833789914. The cubic root of 6513640 is about 186.7560088197.

Adding to 6513640 its reverse (463156), we get a palindrome (6976796).

The spelling of 6513640 in words is "six million, five hundred thirteen thousand, six hundred forty".