6390664 has 32 divisors (see below), whose sum is σ = 13809600. Its totient is φ = 2715840.

The previous prime is 6390653. The next prime is 6390679. The reversal of 6390664 is 4660936.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7374 + ... + 8194.

It is an arithmetic number, because the mean of its divisors is an integer number (431550).

Almost surely, 2^6390664 is an apocalyptic number.

It is an amenable number.

6390664 is an abundant number, since it is smaller than the sum of its proper divisors (7418936).

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

6390664 is a wasteful number, since it uses less digits than its factorization.

6390664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973 (or 969 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 6390664 is about 2527.9762657114. The cubic root of 6390664 is about 185.5732305080.

The spelling of 6390664 in words is "six million, three hundred ninety thousand, six hundred sixty-four".