6647643 has 8 divisors (see below), whose sum is σ = 9848400. Its totient is φ = 4431744.

The previous prime is 6647623. The next prime is 6647647. The reversal of 6647643 is 3467466.

6647643 is a `hidden beast` number, since 6 + 6 + 4 + 7 + 643 = 666.

It is not a de Polignac number, because 6647643 - 2⁶ = 6647579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6647598 and 6647607.

It is not an unprimeable number, because it can be changed into a prime (6647647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123078 + ... + 123131.

It is an arithmetic number, because the mean of its divisors is an integer number (1231050).

Almost surely, 2^6647643 is an apocalyptic number.

6647643 is a deficient number, since it is larger than the sum of its proper divisors (3200757).

6647643 is a wasteful number, since it uses less digits than its factorization.

6647643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246218 (or 246212 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 6647643 is about 2578.3023484456. The cubic root of 6647643 is about 188.0280156680.

The spelling of 6647643 in words is "six million, six hundred forty-seven thousand, six hundred forty-three".