6641885 has 8 divisors (see below), whose sum is σ = 8021976. Its totient is φ = 5279040.

The previous prime is 6641867. The next prime is 6641891. The reversal of 6641885 is 5881466.

It can be written as a sum of positive squares in 4 ways, for example, as 1006009 + 5635876 = 1003^2 + 2374^2 .

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

It is not a de Polignac number, because 6641885 - 2⁶ = 6641821 is a prime.

It is a super-2 number, since 2×6641885² = 88229272706450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3446 + ... + 5015.

It is an arithmetic number, because the mean of its divisors is an integer number (1002747).

Almost surely, 2^6641885 is an apocalyptic number.

It is an amenable number.

6641885 is a deficient number, since it is larger than the sum of its proper divisors (1380091).

6641885 is a wasteful number, since it uses less digits than its factorization.

6641885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8623.

The product of its digits is 46080, while the sum is 38.

The square root of 6641885 is about 2577.1854803254. The cubic root of 6641885 is about 187.9737118064.

The spelling of 6641885 in words is "six million, six hundred forty-one thousand, eight hundred eighty-five".