6647641 has 32 divisors (see below), whose sum is σ = 9273600. Its totient is φ = 4596480.

The previous prime is 6647623. The next prime is 6647647. The reversal of 6647641 is 1467466.

6647641 = 224² + 225² + ... + 314².

It is a happy number.

It is not a de Polignac number, because 6647641 - 2⁹ = 6647129 is a prime.

It is a super-2 number, since 2×6647641² = 88382261729762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6647597 and 6647606.

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 31 ways as a sum of consecutive naturals, for example, 28915 + ... + 29143.

It is an arithmetic number, because the mean of its divisors is an integer number (289800).

Almost surely, 2^6647641 is an apocalyptic number.

It is an amenable number.

6647641 is a deficient number, since it is larger than the sum of its proper divisors (2625959).

6647641 is a wasteful number, since it uses less digits than its factorization.

6647641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289.

The product of its digits is 24192, while the sum is 34.

The square root of 6647641 is about 2578.3019605934. The cubic root of 6647641 is about 188.0279968114.

The spelling of 6647641 in words is "six million, six hundred forty-seven thousand, six hundred forty-one".