6640884844 has 24 divisors (see below), whose sum is σ = 12770605008. Its totient is φ = 2996547840.

The previous prime is 6640884827. The next prime is 6640884847. The reversal of 6640884844 is 4484880466.

It is a super-2 number, since 2×6640884844² = 88202703022537808672, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6640884791 and 6640884800.

It is not an unprimeable number, because it can be changed into a prime (6640884847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544809 + ... + 556864.

It is an arithmetic number, because the mean of its divisors is an integer number (532108542).

Almost surely, 2^6640884844 is an apocalyptic number.

It is an amenable number.

6640884844 is a deficient number, since it is larger than the sum of its proper divisors (6129720164).

6640884844 is a wasteful number, since it uses less digits than its factorization.

6640884844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101825 (or 1101823 counting only the distinct ones).

The product of its (nonzero) digits is 4718592, while the sum is 52.

The square root of 6640884844 is about 81491.6243794416. The cubic root of 6640884844 is about 1879.6427610788.

The spelling of 6640884844 in words is "six billion, six hundred forty million, eight hundred eighty-four thousand, eight hundred forty-four".