6647963 has 8 divisors (see below), whose sum is σ = 7722720. Its totient is φ = 5604480.

The previous prime is 6647959. The next prime is 6647983. The reversal of 6647963 is 3697466.

It is a happy number.

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

It is not a de Polignac number, because 6647963 - 2² = 6647959 is a prime.

It is a d-powerful number, because it can be written as 6⁴ + 6⁶ + 4¹¹ + 7 + 9⁶ + 6⁷ + 3¹³ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6647963.

It is not an unprimeable number, because it can be changed into a prime (6647923) 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, 7358 + ... + 8211.

It is an arithmetic number, because the mean of its divisors is an integer number (965340).

Almost surely, 2^6647963 is an apocalyptic number.

6647963 is a deficient number, since it is larger than the sum of its proper divisors (1074757).

6647963 is a wasteful number, since it uses less digits than its factorization.

6647963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15637.

The product of its digits is 163296, while the sum is 41.

The square root of 6647963 is about 2578.3644040360. The cubic root of 6647963 is about 188.0310326771.

The spelling of 6647963 in words is "six million, six hundred forty-seven thousand, nine hundred sixty-three".