6520020624 has 120 divisors (see below), whose sum is σ = 19973108792. Its totient is φ = 1973237760.

The previous prime is 6520020607. The next prime is 6520020649. The reversal of 6520020624 is 4260200256.

6520020624 is a `hidden beast` number, since 652 + 0 + 0 + 2 + 0 + 6 + 2 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1100116224 + 5419904400 = 33168^2 + 73620^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85644 + ... + 142740.

Almost surely, 2^6520020624 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 6520020624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9986554396).

6520020624 is an abundant number, since it is smaller than the sum of its proper divisors (13453088168).

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

6520020624 is a wasteful number, since it uses less digits than its factorization.

6520020624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57185 (or 57176 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 6520020624 is about 80746.6446609393. The cubic root of 6520020624 is about 1868.1696966431.

The spelling of 6520020624 in words is "six billion, five hundred twenty million, twenty thousand, six hundred twenty-four".