6664688 has 10 divisors (see below), whose sum is σ = 12912864. Its totient is φ = 3332336.

The previous prime is 6664667. The next prime is 6664711. The reversal of 6664688 is 8864666.

It is a super-2 number, since 2×6664688² = 88836132274688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208256 + ... + 208287.

Almost surely, 2^6664688 is an apocalyptic number.

It is an amenable number.

6664688 is a deficient number, since it is larger than the sum of its proper divisors (6248176).

6664688 is a wasteful number, since it uses less digits than its factorization.

6664688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416551 (or 416545 counting only the distinct ones).

The product of its digits is 331776, while the sum is 44.

The square root of 6664688 is about 2581.6057018840. The cubic root of 6664688 is about 188.1885839675.

The spelling of 6664688 in words is "six million, six hundred sixty-four thousand, six hundred eighty-eight".