6393664 has 14 divisors (see below), whose sum is σ = 12687554. Its totient is φ = 3196800.

The previous prime is 6393661. The next prime is 6393691. The reversal of 6393664 is 4663936.

It can be written as a sum of positive squares in only one way, i.e., 6350400 + 43264 = 2520^2 + 208^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6393661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49887 + ... + 50014.

Almost surely, 2^6393664 is an apocalyptic number.

6393664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6393664 is a deficient number, since it is larger than the sum of its proper divisors (6293890).

6393664 is an equidigital number, since it uses as much as digits as its factorization.

6393664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99913 (or 99903 counting only the distinct ones).

The product of its digits is 69984, while the sum is 37.

The square root of 6393664 is about 2528.5695560929. The cubic root of 6393664 is about 185.6022641420.

It can be divided in two parts, 63936 and 64, that multiplied together give a palindrome (4091904).

The spelling of 6393664 in words is "six million, three hundred ninety-three thousand, six hundred sixty-four".