6520239504 has 75 divisors (see below), whose sum is σ = 18879882043. Its totient is φ = 2172444192.

The previous prime is 6520239497. The next prime is 6520239521. The reversal of 6520239504 is 4059320256.

The square root of 6520239504 is 80748.

It is a perfect power (a square), and thus also a powerful number.

6520239504 is a `hidden beast` number, since 65 + 202 + 395 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2905807 + ... + 2908049.

Almost surely, 2^6520239504 is an apocalyptic number.

6520239504 is the 80748-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6520239504

6520239504 is an abundant number, since it is smaller than the sum of its proper divisors (12359642539).

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

6520239504 is an frugal number, since it uses more digits than its factorization.

6520239504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4506 (or 2248 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The cubic root of 6520239504 is about 1868.1906015057.

Multiplying 6520239504 by its sum of digits (36), we get a square (234728622144 = 484488²).

6520239504 divided by its sum of digits (36) gives a square (181117764 = 13458²).

The spelling of 6520239504 in words is "six billion, five hundred twenty million, two hundred thirty-nine thousand, five hundred four".