6640944 has 40 divisors (see below), whose sum is σ = 17713152. Its totient is φ = 2141760.

The previous prime is 6640939. The next prime is 6640967. The reversal of 6640944 is 4490466.

It is a super-2 number, since 2×6640944² = 88204274422272, which contains 22 as substring.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 744 + ... + 3719.

Almost surely, 2^6640944 is an apocalyptic number.

It is an amenable number.

6640944 is an abundant number, since it is smaller than the sum of its proper divisors (11072208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6640944 is a wasteful number, since it uses less digits than its factorization.

6640944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4505 (or 4499 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 6640944 is about 2577.0029103592. The cubic root of 6640944 is about 187.9648342254.

The spelling of 6640944 in words is "six million, six hundred forty thousand, nine hundred forty-four".