6489105680 has 20 divisors (see below), whose sum is σ = 15087170892. Its totient is φ = 2595642240.

The previous prime is 6489105647. The next prime is 6489105697. The reversal of 6489105680 is 865019846.

It can be written as a sum of positive squares in 2 ways, for example, as 3529310464 + 2959795216 = 59408^2 + 54404^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40556831 + ... + 40556990.

Almost surely, 2^6489105680 is an apocalyptic number.

It is an amenable number.

6489105680 is an abundant number, since it is smaller than the sum of its proper divisors (8598065212).

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

6489105680 is a wasteful number, since it uses less digits than its factorization.

6489105680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81113834 (or 81113828 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 47.

The square root of 6489105680 is about 80554.9854447259. The cubic root of 6489105680 is about 1865.2123499484.

The spelling of 6489105680 in words is "six billion, four hundred eighty-nine million, one hundred five thousand, six hundred eighty".