6404663 has 4 divisors (see below), whose sum is σ = 6577800. Its totient is φ = 6231528.

The previous prime is 6404659. The next prime is 6404669. The reversal of 6404663 is 3664046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6404663 - 2² = 6404659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86513 + ... + 86586.

It is an arithmetic number, because the mean of its divisors is an integer number (1644450).

Almost surely, 2^6404663 is an apocalyptic number.

6404663 is a deficient number, since it is larger than the sum of its proper divisors (173137).

6404663 is a wasteful number, since it uses less digits than its factorization.

6404663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173136.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 6404663 is about 2530.7435666223. The cubic root of 6404663 is about 185.7086334994.

The spelling of 6404663 in words is "six million, four hundred four thousand, six hundred sixty-three".