6520728884 has 12 divisors (see below), whose sum is σ = 11412468900. Its totient is φ = 3260023488.

The previous prime is 6520728881. The next prime is 6520728889. The reversal of 6520728884 is 4888270256.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4903080484 + 1617648400 = 70022^2 + 40220^2 .

It is a super-3 number, since 3×6520728884³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520728881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39479 + ... + 120830.

It is an arithmetic number, because the mean of its divisors is an integer number (951039075).

Almost surely, 2^6520728884 is an apocalyptic number.

It is an amenable number.

6520728884 is a deficient number, since it is larger than the sum of its proper divisors (4891740016).

6520728884 is a wasteful number, since it uses less digits than its factorization.

6520728884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170482 (or 170480 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 50.

The square root of 6520728884 is about 80751.0302349140. The cubic root of 6520728884 is about 1868.2373396787.

The spelling of 6520728884 in words is "six billion, five hundred twenty million, seven hundred twenty-eight thousand, eight hundred eighty-four".