6646889 has 8 divisors (see below), whose sum is σ = 6858432. Its totient is φ = 6438640.

The previous prime is 6646883. The next prime is 6646891. The reversal of 6646889 is 9886466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6646889 - 2⁴ = 6646873 is a prime.

It is a super-2 number, since 2×6646889² = 88362266756642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6646883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3644 + ... + 5154.

It is an arithmetic number, because the mean of its divisors is an integer number (857304).

Almost surely, 2^6646889 is an apocalyptic number.

It is an amenable number.

6646889 is a deficient number, since it is larger than the sum of its proper divisors (211543).

6646889 is a wasteful number, since it uses less digits than its factorization.

6646889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647.

The product of its digits is 497664, while the sum is 47.

The square root of 6646889 is about 2578.1561240546. The cubic root of 6646889 is about 188.0209064573.

It can be divided in two parts, 664 and 6889, that multiplied together give a cube (4574296 = 166³).

The spelling of 6646889 in words is "six million, six hundred forty-six thousand, eight hundred eighty-nine".