6381664 has 24 divisors (see below), whose sum is σ = 13304088. Its totient is φ = 3002880.

The previous prime is 6381659. The next prime is 6381667. The reversal of 6381664 is 4661836.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6381667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5322 + ... + 6409.

It is an arithmetic number, because the mean of its divisors is an integer number (554337).

Almost surely, 2^6381664 is an apocalyptic number.

It is an amenable number.

6381664 is an abundant number, since it is smaller than the sum of its proper divisors (6922424).

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

6381664 is a wasteful number, since it uses less digits than its factorization.

6381664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11758 (or 11750 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 6381664 is about 2526.1955585425. The cubic root of 6381664 is about 185.4860750512.

The spelling of 6381664 in words is "six million, three hundred eighty-one thousand, six hundred sixty-four".