6449681 has 16 divisors (see below), whose sum is σ = 7910784. Its totient is φ = 5132544.

The previous prime is 6449671. The next prime is 6449693. The reversal of 6449681 is 1869446.

It is a cyclic number.

It is not a de Polignac number, because 6449681 - 2⁶ = 6449617 is a prime.

It is a super-2 number, since 2×6449681² = 83196770003522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6449671) 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, 9551 + ... + 10203.

It is an arithmetic number, because the mean of its divisors is an integer number (494424).

Almost surely, 2^6449681 is an apocalyptic number.

It is an amenable number.

6449681 is a deficient number, since it is larger than the sum of its proper divisors (1461103).

6449681 is a wasteful number, since it uses less digits than its factorization.

6449681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760.

The product of its digits is 41472, while the sum is 38.

The square root of 6449681 is about 2539.6222159999. The cubic root of 6449681 is about 186.1427296956.

The spelling of 6449681 in words is "six million, four hundred forty-nine thousand, six hundred eighty-one".