6528780865 has 8 divisors (see below), whose sum is σ = 7835118120. Its totient is φ = 5222637312.

The previous prime is 6528780847. The next prime is 6528780887. The reversal of 6528780865 is 5680878256.

It is a happy number.

6528780865 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2708057521 + 3820723344 = 52039^2 + 61812^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6528780865 - 2⁵ = 6528780833 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40617 + ... + 121273.

It is an arithmetic number, because the mean of its divisors is an integer number (979389765).

Almost surely, 2^6528780865 is an apocalyptic number.

It is an amenable number.

6528780865 is a deficient number, since it is larger than the sum of its proper divisors (1306337255).

6528780865 is a wasteful number, since it uses less digits than its factorization.

6528780865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96851.

The product of its (nonzero) digits is 6451200, while the sum is 55.

The square root of 6528780865 is about 80800.8716846545. The cubic root of 6528780865 is about 1869.0060075290.

The spelling of 6528780865 in words is "six billion, five hundred twenty-eight million, seven hundred eighty thousand, eight hundred sixty-five".