6640658 has 8 divisors (see below), whose sum is σ = 10005552. Its totient is φ = 3305476.

The previous prime is 6640657. The next prime is 6640663. The reversal of 6640658 is 8560466.

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

It is not an unprimeable number, because it can be changed into a prime (6640651) 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, 6860 + ... + 7767.

It is an arithmetic number, because the mean of its divisors is an integer number (1250694).

Almost surely, 2^6640658 is an apocalyptic number.

6640658 is a deficient number, since it is larger than the sum of its proper divisors (3364894).

6640658 is a wasteful number, since it uses less digits than its factorization.

6640658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14856.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 6640658 is about 2576.9474189436. The cubic root of 6640658 is about 187.9621358783.

The spelling of 6640658 in words is "six million, six hundred forty thousand, six hundred fifty-eight".