6491668 has 6 divisors (see below), whose sum is σ = 11360426. Its totient is φ = 3245832.

The previous prime is 6491663. The next prime is 6491669. The reversal of 6491668 is 8661946.

It can be written as a sum of positive squares in only one way, i.e., 5299204 + 1192464 = 2302^2 + 1092^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6491668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6491663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811455 + ... + 811462.

Almost surely, 2^6491668 is an apocalyptic number.

It is an amenable number.

6491668 is a deficient number, since it is larger than the sum of its proper divisors (4868758).

6491668 is a wasteful number, since it uses less digits than its factorization.

6491668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622921 (or 1622919 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 6491668 is about 2547.8751931757. The cubic root of 6491668 is about 186.5457819932.

The spelling of 6491668 in words is "six million, four hundred ninety-one thousand, six hundred sixty-eight".