6520855728 has 80 divisors (see below), whose sum is σ = 17472604896. Its totient is φ = 2093875200.

The previous prime is 6520855711. The next prime is 6520855753. The reversal of 6520855728 is 8275580256.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 161200 + ... + 197552.

Almost surely, 2^6520855728 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 6520855728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8736302448).

6520855728 is an abundant number, since it is smaller than the sum of its proper divisors (10951749168).

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

6520855728 is a wasteful number, since it uses less digits than its factorization.

6520855728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36502 (or 36496 counting only the distinct ones).

The product of its (nonzero) digits is 1344000, while the sum is 48.

The square root of 6520855728 is about 80751.8156328389. The cubic root of 6520855728 is about 1868.2494535167.

The spelling of 6520855728 in words is "six billion, five hundred twenty million, eight hundred fifty-five thousand, seven hundred twenty-eight".