6489766578 has 32 divisors (see below), whose sum is σ = 13920465600. Its totient is φ = 2010730176.

The previous prime is 6489766571. The next prime is 6489766651. The reversal of 6489766578 is 8756679846.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6489766571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 531013 + ... + 543096.

It is an arithmetic number, because the mean of its divisors is an integer number (435014550).

Almost surely, 2^6489766578 is an apocalyptic number.

6489766578 is an abundant number, since it is smaller than the sum of its proper divisors (7430699022).

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

6489766578 is a wasteful number, since it uses less digits than its factorization.

6489766578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074186.

The product of its digits is 121927680, while the sum is 66.

The square root of 6489766578 is about 80559.0874948320. The cubic root of 6489766578 is about 1865.2756700896.

The spelling of 6489766578 in words is "six billion, four hundred eighty-nine million, seven hundred sixty-six thousand, five hundred seventy-eight".