6426664 has 8 divisors (see below), whose sum is σ = 12050010. Its totient is φ = 3213328.

The previous prime is 6426659. The next prime is 6426689. The reversal of 6426664 is 4666246.

It can be written as a sum of positive squares in only one way, i.e., 4884100 + 1542564 = 2210^2 + 1242^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401659 + ... + 401674.

Almost surely, 2^6426664 is an apocalyptic number.

It is an amenable number.

6426664 is a deficient number, since it is larger than the sum of its proper divisors (5623346).

6426664 is a wasteful number, since it uses less digits than its factorization.

6426664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803339 (or 803335 counting only the distinct ones).

The product of its digits is 41472, while the sum is 34.

The square root of 6426664 is about 2535.0865862925. The cubic root of 6426664 is about 185.9210363551.

The spelling of 6426664 in words is "six million, four hundred twenty-six thousand, six hundred sixty-four".