6499664 has 20 divisors (see below), whose sum is σ = 12648000. Its totient is φ = 3235680.

The previous prime is 6499663. The next prime is 6499667. The reversal of 6499664 is 4669946.

It is a happy number.

It is a super-2 number, since 2×6499664² = 84491264225792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6499663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3587 + ... + 5085.

It is an arithmetic number, because the mean of its divisors is an integer number (632400).

Almost surely, 2^6499664 is an apocalyptic number.

It is an amenable number.

6499664 is a deficient number, since it is larger than the sum of its proper divisors (6148336).

6499664 is a wasteful number, since it uses less digits than its factorization.

6499664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778 (or 1772 counting only the distinct ones).

The product of its digits is 279936, while the sum is 44.

The square root of 6499664 is about 2549.4438609234. The cubic root of 6499664 is about 186.6223420835.

The spelling of 6499664 in words is "six million, four hundred ninety-nine thousand, six hundred sixty-four".