6520567440 has 160 divisors (see below), whose sum is σ = 21485767680. Its totient is φ = 1631190528.

The previous prime is 6520567411. The next prime is 6520567453. The reversal of 6520567440 is 447650256.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 462739 + ... + 476621.

It is an arithmetic number, because the mean of its divisors is an integer number (134286048).

Almost surely, 2^6520567440 is an apocalyptic number.

6520567440 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 6520567440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10742883840).

6520567440 is an abundant number, since it is smaller than the sum of its proper divisors (14965200240).

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

6520567440 is a wasteful number, since it uses less digits than its factorization.

6520567440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14021 (or 14015 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 39.

The square root of 6520567440 is about 80750.0305882295. The cubic root of 6520567440 is about 1868.2219212490.

The spelling of 6520567440 in words is "six billion, five hundred twenty million, five hundred sixty-seven thousand, four hundred forty".