6520845840 has 80 divisors (see below), whose sum is σ = 20360155200. Its totient is φ = 1726373376.

The previous prime is 6520845833. The next prime is 6520845853. The reversal of 6520845840 is 485480256.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 6520845792 and 6520845801.

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, 64375 + ... + 131094.

It is an arithmetic number, because the mean of its divisors is an integer number (254501940).

Almost surely, 2^6520845840 is an apocalyptic number.

6520845840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6520845840 is an abundant number, since it is smaller than the sum of its proper divisors (13839309360).

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

6520845840 is a wasteful number, since it uses less digits than its factorization.

6520845840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195624 (or 195618 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 42.

The square root of 6520845840 is about 80751.7544081861. The cubic root of 6520845840 is about 1868.2485091999.

The spelling of 6520845840 in words is "six billion, five hundred twenty million, eight hundred forty-five thousand, eight hundred forty".