6449989489 has 16 divisors (see below), whose sum is σ = 6920383680. Its totient is φ = 5993809920.

The previous prime is 6449989423. The next prime is 6449989531. The reversal of 6449989489 is 9849899446.

It is a happy number.

It is not a de Polignac number, because 6449989489 - 2²⁹ = 5913118577 is a prime.

It is a super-2 number, since 2×6449989489² = 83204728816420962242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6449989409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192774 + ... + 223744.

It is an arithmetic number, because the mean of its divisors is an integer number (432523980).

Almost surely, 2^6449989489 is an apocalyptic number.

It is an amenable number.

6449989489 is a deficient number, since it is larger than the sum of its proper divisors (470394191).

6449989489 is a wasteful number, since it uses less digits than its factorization.

6449989489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31200.

The product of its digits is 161243136, while the sum is 70.

The square root of 6449989489 is about 80311.8265823907. The cubic root of 6449989489 is about 1861.4569739116.

The spelling of 6449989489 in words is "six billion, four hundred forty-nine million, nine hundred eighty-nine thousand, four hundred eighty-nine".