6644869 has 8 divisors (see below), whose sum is σ = 8284608. Its totient is φ = 5177760.

The previous prime is 6644863. The next prime is 6644873. The reversal of 6644869 is 9684466.

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

It is not a de Polignac number, because 6644869 - 2⁵ = 6644837 is a prime.

It is a super-2 number, since 2×6644869² = 88308568054322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644863) 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, 43072 + ... + 43225.

It is an arithmetic number, because the mean of its divisors is an integer number (1035576).

Almost surely, 2^6644869 is an apocalyptic number.

It is an amenable number.

6644869 is a deficient number, since it is larger than the sum of its proper divisors (1639739).

6644869 is a wasteful number, since it uses less digits than its factorization.

6644869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86315.

The product of its digits is 248832, while the sum is 43.

The square root of 6644869 is about 2577.7643414401. The cubic root of 6644869 is about 188.0018579113.

The spelling of 6644869 in words is "six million, six hundred forty-four thousand, eight hundred sixty-nine".