6731649 has 12 divisors (see below), whose sum is σ = 9749376. Its totient is φ = 4475832.

The previous prime is 6731639. The next prime is 6731651. The reversal of 6731649 is 9461376.

6731649 is a `hidden beast` number, since 6 + 7 + 3 + 1 + 649 = 666.

It is not a de Polignac number, because 6731649 - 2⁴ = 6731633 is a prime.

It is a Curzon number.

6731649 is a lucky number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (6731639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3784 + ... + 5270.

It is an arithmetic number, because the mean of its divisors is an integer number (812448).

Almost surely, 2^6731649 is an apocalyptic number.

It is an amenable number.

6731649 is a deficient number, since it is larger than the sum of its proper divisors (3017727).

6731649 is a wasteful number, since it uses less digits than its factorization.

6731649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996 (or 1993 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 6731649 is about 2594.5421561424. The cubic root of 6731649 is about 188.8167367769.

The spelling of 6731649 in words is "six million, seven hundred thirty-one thousand, six hundred forty-nine".