6640456 has 16 divisors (see below), whose sum is σ = 12504240. Its totient is φ = 3306000.

The previous prime is 6640453. The next prime is 6640463. The reversal of 6640456 is 6540466.

It is not an unprimeable number, because it can be changed into a prime (6640451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355 + ... + 3661.

It is an arithmetic number, because the mean of its divisors is an integer number (781515).

Almost surely, 2^6640456 is an apocalyptic number.

It is an amenable number.

6640456 is a deficient number, since it is larger than the sum of its proper divisors (5863784).

6640456 is a wasteful number, since it uses less digits than its factorization.

6640456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3564 (or 3560 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 6640456 is about 2576.9082249859. The cubic root of 6640456 is about 187.9602300061.

The spelling of 6640456 in words is "six million, six hundred forty thousand, four hundred fifty-six".