6404664 has 64 divisors (see below), whose sum is σ = 18604800. Its totient is φ = 1799424.

The previous prime is 6404659. The next prime is 6404669. The reversal of 6404664 is 4664046.

It is an interprime number because it is at equal distance from previous prime (6404659) and next prime (6404669).

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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10972 + ... + 11540.

It is an arithmetic number, because the mean of its divisors is an integer number (290700).

Almost surely, 2^6404664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6404664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9302400).

6404664 is an abundant number, since it is smaller than the sum of its proper divisors (12200136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6404664 is a wasteful number, since it uses less digits than its factorization.

6404664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652 (or 648 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 6404664 is about 2530.7437641927. The cubic root of 6404664 is about 185.7086431647.

The spelling of 6404664 in words is "six million, four hundred four thousand, six hundred sixty-four".